Before he got hurt in Texas, he was lights out as a starter.
Once he got up to the appropriate pitch count, he started 9 games at a 100 pitch count...
54IP 46H 12ER 59K 18BB 2.00ERA 9.8K/9IP 1.18WHIP
After that, he pitching in Texas and "inflamed" his shoulder and was never the same. During that run, he was lights out dominant and the best pitcher on the staff. Over time, had his shoulder actually been ready for the workload, I have no doubt he'd at least been on par with Brandon Morrow or Max Scherzer, guys with lights out fastballs and dominant stuff capable of striking out 10 a night. When he returned from that shoulder injury, he looked afraid to let it loose and that never shook. They f***ed him up completely