Tampa Bay has targeted basically two kinds of player in trades over the past few years — specifically, big-league-ready types who either (a) could function as a starting pitcher or (b) feature contact skills and the capacity to play an up-the-middle defensive position. Perez, a catcher, fits the latter category and has made strides this year defensively, moving from a 50 to a 55 behind the plate, driven by his improvement metrically in the framing department. There isn’t much in the way of publicly available minor-league framing numbers, and there’s some variance even with the big leagues ones, but multiple front-office sources described Perez’s figures this year as “elite.” He’s a definite hit-over-power type offensively and is seen as a future backup with just mistake power, but sometimes these types can turn into low-end regulars for a few years. He will likely be a 40+ FV in the coming update to THE BOARD, adding to Tampa Bay’s embarrassment of minor-league depth that was already supplemented earlier today.
Perez was the headliner here. Shaffer, meanwhile, is more of a generic depth arm. He was a sixth-rounder in 2017 out of Maryland and would occasionally show fringey stuff (87-91 mph) and sometimes more than that (90-93 mph with above-average life). His 6-foot-5, 220-pound frame is durable and he throws strikes, so any kind of improvement in the stuff department would make him a solid bet to turn into a back-end starter. He’s been mostly 89-92, touching 94 mph, this year with a slider that’s fringey to average and a changeup that’s a little better but mostly average. In today’s game, this is somewhere in the range of a sixth starter, swing man, innings-eating middle reliever or up/down fill arm, as indicated by the fact that Shaffer is still pitching in Low-A at nearly 22 years old. Shaffer will likely be a 35 or 35+ FV.
Kiley McDaniel has worked as an executive and scout, most recently for the Atlanta Braves, also for the New York Yankees, Baltimore Orioles and Pittsburgh Pirates. He's written for ESPN, Fox Sports and Baseball Prospectus. Follow him on twitter.