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There are competing theories on how, assuming an imperfect supply both of resources and assets, to best build a team. For instance, construct a roster with stars and scrubs or pursue a more balanced approach? Chicago White Sox general manager Rich Hahn — and, I believe, most general managers — are entrenched in the balanced-approach camp.

Hahn has generally been praised this offseason as he’s embarked on a rebuild project, and deservedly so. He added the game’s No. 2 overall prospect according to Baseball America and MLB.com, in Yoan Moncada and three potential impact arms in Lucas Giolito, Michael Kopech and Reynaldo Lopez in trades that sent Chris Sale to the Red Sox and Adam Eaton to the Nationals.

In making those deals, Hahn traded two players on team-friendly deals, in their primes, who accounted for nearly 40% of the team’s total WAR production last season. Hahn hopes that, in return, the trades yield the core of a team that enjoys a greater breadth of talent. Said Hahn recently to MLB.com:

“The last few years we’ve had a very top-heavy roster and the reason we haven’t won had nothing to do with the quality players at the top end of that roster,” Hahn said. “When the time comes that we are in a position to contend again, we are going to be approaching that with ideally a much deeper, more thoroughly balanced roster than what we had. It had to do with what was going on with not just one through 25, but one through 35 or 40. So now as we approach this, we have to build that organizational quality depth, not just insurance policies, but real high-caliber depth.”

The end is perhaps not quite yet here for the stars-and-scubs approach. The Angels have Mike Trout and everybody else and hope to contend with that arrangement. The Marlins have Giancarlo Stanton and Christian Yelich but one of the game’s thinnest farm systems.

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Yesterday, we identified Jeremy Jeffress as a pitcher who benefited greatly from dropping his arm slot, adding more sink and fade to his two-seamer. The idea was that his four-seamer was straight and possessed below-average spin, so moving from that pitch to a sinker, while dropping the slot, gave him a better foundational fastball. There’s a roadmap there. Let’s follow it.

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Two weeks have elapsed since I last wrote about the Rockies, so I hope enough time has passed to allow me to return to the subject matter.

As we know, Colorado has experimented with a number of approaches to pitching at Coors Field, from sinker-heavy staffs to expensive free agents to four-man rotations. Nothing, it seems, has worked. Back in January, I wrote about how the Rockies ought to be a center of pitching innovation when I advocated for the club to break away from the traditional five-man rotation.

While battling fatigue is one significant issue tied to pitching at altitude, another is, of course, the movement of pitches in the thin air. One kind FanGraphs reader directed my attention to a Dan Rozenson study on pitch effectiveness at Coors Field.

Wrote Rozenson:

There is strong evidence that the slider performs in absolute and comparative terms better than the curveball in Coors Field. Part of this can probably be attributed to the fact that sliders deviate from the “gyroball” trajectory of a pitch thrown in a vacuum the least of the major pitch types. Sinking fastballs also have a sharp drop-off in performance at Coors, and there is some evidence that using a cut fastball would be a good alternative.

Rockies management would be wise to learn from failed pitching experiments past. Their system ought to emphasize pitchers developing an arsenal of pitches that could be used effectively at home. This most obviously means encouraging their pitchers to throw sliders instead of curveballs as their main breaking ball, although further study might be able to illuminate what other pitches offer a comparative advantage in Denver.

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Last week, Travis Sawchik wrote an outstanding article titled “Can More MLB Hitters Get Off the Ground?” The article went in depth about the optimal swing plane, and about the resistance it can face within the game when a player’s thinking about trying to hit the ball in the air. Players have been instructed for decades to swing down on the ball in an attempt to generate backspin. Recent breakouts like Josh Donaldson and Justin Turner, however, can vouch for simply letting it fly. They’ve found their success from always swinging up.

For the most part, right now, the conversation is built upon anecdotes. There have been players who have changed their swings, but we haven’t seen anything reflected in the overall league numbers. Last year, the average ground-ball rate was 45%. Five years ago, the average ground-ball rate was 45%. That number seldom budges, and it does in part speak to baseball’s consistency. We aren’t seeing a reflection of a whole bunch of guys suddenly adopting uppercuts.

But then, it all depends on how you dig. It turns out there is something. A sign, if a small one, that we’ve entered a period of transition.

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Pitchers and catchers have been in camp for all of a day and a half, and the baseball gods may have already claimed the first pitcher to feed their insatiable hunger for elbow ligaments and heartbreak. Alex Reyes of the Cardinals, a top-five prospect in all of baseball — if not the best (keep an eye out for Eric Longenhagen’s final rankings) — is headed for an MRI after experiencing the dreaded elbow discomfort. According to Jeff Passan, there’s significant worry within the organization that Reyes will need Tommy John surgery.

That’s a massive blow to the Cardinals, who were almost surely counting on Reyes for major contributions in their rotation. The rest of the pitching staff is largely a patchwork of the old (Adam Wainwright), the ineffective (Mike Leake) and the recently repaired (Lance Lynn). Only Carlos Martinez stands out as a real candidate to turn in 190 or so genuinely good innings. Knowing the Cardinals, they’ll probably still get a few prospects to emerge out of thin air and provide value at the big-league level, but Reyes is Reyes.

His fastball is the sort of pitch that’s spoken of in hushed and reverent tones. The curveball isn’t far behind. He’s the prototypical über-prospect in the age of Noah Syndergaard. He’s what they look like. For a Cards team that’s projected to win just 84 games, he was going to be a vital cog. He may be gone for the whole season.

There are two major implications here: one for the status of the club this year and one for the status of Reyes and his career. The second is largely an unknown. Every elbow reacts differently. Reyes may not need Tommy John. He may need it, and then another one. The Cards are almost surely praying that he’ll just need rest and rehabilitation, and that the ligament is still somewhat intact. Ervin Santana and Masahiro Tanaka have been pitching with partial tears of their ulnar collateral ligaments. It can be done, but it would likely eat into Reyes’ titanic velocity. We don’t yet know what the damage is.

If he does require surgery, the prognosis isn’t excellent. Research by Jon Roegele suggests that, for pitchers who undergo a Tommy John procedure between ages 16 and 23 (Reyes is 22), the median figure for innings pitched after the surgery is just 221. Only 40% of pitchers in that age group reach the 500-inning threshold. That 221-inning mark is worrisome for someone of Reyes’ age. But again, we’re not yet certain if he’ll need surgery.

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Monday afternoon, I put up an InstaGraphs post titled “The Least Intimidating Hitter in Baseball.” The idea was to use a formula including fastball rate and zone rate, because, the way I figure, the more aggressively a hitter gets pitched, the less the pitchers are afraid of. I combined a couple z-scores to get a number I’ll refer to today as the Aggressiveness Index, and many of the players in the linked post are unsurprising. Turns out pitchers go after Ben Revere aggressively. Ditto Nori Aoki and Billy Burns. There’s nothing weird there.

But a certain name showed up in eighth place. Last year, pitchers didn’t show any significant fear of facing DJ LeMahieu. That makes sense if you weren’t paying attention, but LeMahieu played every day, and finished with a 128 wRC+. LeMahieu, ever so quietly, had himself a breakout, four-win season, yet it looks like pitchers just didn’t care.

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Yesterday, the Royals reportedly agreed to a two year, $12 million contract with free agent left-hander Travis Wood, helping round out a pitching staff that needed some additional depth due to the tragic loss of Yordano Ventura. Wood had several other suitors, and in order to help convince him to come to Kansas City, it appears that the team has offered him a chance to compete for a spot in the starting rotation.

There’s nothing wrong with giving him a shot in spring training, especially since Nate Karns — the likely fifth starter before Wood signed — isn’t exactly a surefire starter himself. But while Wood is a useful pitcher who could likely be a significant asset for the Royals in a bullpen role, the Royals should probably hope that he bombs his rotation audition and accepts a role in relief instead.

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