Coshow remains an enigma after being converted to a full-time reliever in May of 2016 – at times flashing shut-down dominance when he’s commanding his fastball/slider combo, and at other times missing his spots and generating a lot of traffic on the bases via hard contact and walks.
Coshow has a massive, Texas-strong build (Oklahoma, actually), with a huge lower half, broad shoulders and barrel chest. He added 10 pounds to his listed weight this year to 270 pounds, so maintaining the body is a must from here. The arm action is long in the back and fluid, and the delivery is energetic and up-tempo. He drives hard off the rubber with a big fall-off to the first-base side, and repeating his release point through his 3/4’s slot with the large moving parts can cause the command and control to come and go. His plus to double-plus fastball was sitting comfortably at 93-to-96 mph (T97) and it’s a real weapon that he uses aggressively, but his command of the offering is below average. He could work it with heavy action with some movement to the glove side in the lower velo range, and it showed run and boring action with late life at the upper range. When he can spot it, he can dominate hitters in short stints with strikeouts (11.6 SO/9) and ground ball outs, but he’ll reach back for extra velo and overthrow it, causing costly misses arm side and into the fat part of the zone. His slider is average, but inconsistent. He gets on the side of it at times, giving it limited depth, though it does have some tilt at the high end of the 85-to-88 mph range, and it can be an effective swing-and-miss secondary when he’s able to get ahead in the count and use it for chase.
The profile has not developed much since his full-time conversion to a reliever in early 2016, and while he’s keeping the ball on the ground at an increased 1.66 GO:AO ratio this year and the control has been fringe-average (3.4 BB/9, though down from 5.0 BB/9 last year), the 10.7 H/9 and .293 batting average against this year are indicative of his loose in-zone command issues. It’s hard to see the stuff playing at the major league level if the fastball command and control profile don’t improve, and the best outcome is that of high-risk Role 30, AAAA emergency arm used in sixth-or-seventh innings, as there’s too much risk deploying him in the high-leverage, late-inning situations that the Yankees might have envisioned his raw stuff being suited for.