Kevin Kiermaier is not going to be voted American League Most Valuable Player. I personally would not vote for Kevin Kiermaier as American League Most Valuable Player. He’ll be on zero radars, and that’s perfectly fine. Other players will be more deserving — I just want to quickly expand on something that came up during my chat last Friday.

Let’s say you really really really wanted to make the Kiermaier MVP case. I don’t know why. Maybe you’re a family member. Maybe you have money on the line. Maybe you just enjoy getting into statistical arguments. Where could you start? I’d recommend starting on May 21. That’s when Kiermaier sustained an injury that knocked him out of action for almost two months. After the Rays game on May 21, they stood at 20-20. They had a strongly positive run differential. Since then, the Rays have posted the worst record in the majors. The run differential has sucked. Kiermaier just returned Friday.

Kiermaier is a decent hitter, all things considered, but you’re a FanGraphs reader and you know him for his defense. So let’s focus on that defense for a second. To what extent could we consider Kiermaier a difference-maker in the outfield? This year, when Kiermaier has started, the Rays have allowed a team BABIP of .260. Meanwhile, when Kiermaier hasn’t started, the Rays have allowed a team BABIP of .341. That’s not all Kiermaier, of course, because not all balls in play are directed toward center field, but that’s an absolutely enormous difference. When Kiermaier went down, the Rays’ run prevention cratered, and that probably isn’t all on the pitchers.

That would have to be around the core of the Kiermaier argument. That, when Kiermaier has been unavailable, the Rays defense hasn’t been able to make up for it. It’s not just center field — Kiermaier’s presence allows the other outfielders to position themselves differently, too. Kiermaier would be thus presented as the keystone. You don’t have to buy it. Obviously, Kiermaier alone isn’t responsible for that whole difference. But there are still so many people who downplay the importance of an elite-level defender. The Rays would argue the opposite.

As long as I’m here, what if we were to expand beyond just 2016? Kiermaier has been a regular or semi-regular going on three years, now. How valuable has his outfield defense been to the Rays? This is one way you could choose to look at it. It would suggest that he’s been extremely valuable.

I know there are a lot of variables folded in here. I know this captures more than just Kiermaier by himself. But we already have numbers that try to capture individual defenders by themselves. This looks from the team perspective, and when Kiermaier has started in the outfield, Rays pitchers have allowed fewer runs per nine, by 70 points. There’s a 38-point gap in BABIP, which works out to nearly a hit a game. Kiermaier has a career DRS of +63 runs. He has a career UZR of +50 runs. The team-level numbers do nothing to make those look silly. If anything, they make them look like under-estimates. Which sounds crazy, but here we are.

The Rays know that Kevin Kiermaier is valuable. You presumably already knew that Kevin Kiermaier is valuable. Could be he’s even more valuable than we thought. And he could be a crucial reason why the Rays are seemingly about to start selling. In a way, when Kiermaier got injured, they just didn’t have a chance.