Shows his Slider has been positive both years and his Splitter was in 2016. Brooks player card says this about his arsenal:
His fourseam fastball has essentially average velo, results in somewhat more flyballs compared to other pitchers' fourseamers, has slight armside run and has some added backspin. His splitter comes in below hitting speed, results in more flyballs compared to other pitchers' splitters and has movement that suggests a lot of backspin. His change generates more whiffs/swing compared to other pitchers' changeups, has a lot of backspin, is slightly firmer than usual, results in somewhat more flyballs compared to other pitchers' changeups and has slight armside fade. His slider has primarily 12-6 movement and has less than expected depth.
I could see the possibility of usefulness from him. Ace, though? He's more than 1 or 2 improvements from that from what I see. But it's the velocity ranges and movement of his pitches that leaves me with no idea where he should focus improvement/changes.
http://www.brooksbaseball.net/velo.php?player=664641&b_hand=-1&gFilt=&pF...|SI|FC|CU|SL|CS|KN|CH|FS|SB&time=game&minmax=ci&var=mph&s_type=2&startDate=03/30/2007&endDate=01/29/2018
http://www.brooksbaseball.net/scatter.php?player=664641&b_hand=-1&x_axis...|SI|FC|CU|SL|CS|KN|CH|FS|SB&time=game&minmax=&y_axis=pfx_z&s_type=2&startDate=03/30/2007&endDate=01/29/2018