He is definitely underperforming this season. Last season was probably in-line with expectations given he is still developing. The biggest problem is that 2nd pitch. Ideally for a 2-pitch pitcher you want both to be good. Also being a lefty doesn’t help. In looking at your team defense you had the 5th most negative plays this season so that also could have been a factor. I would expect his numbers to improve, but a better defense will also help.