From Fangraphs:
Percentage of fastballs thrown: 52% (all of his fastballs-38.1% four seam, less than 10% two seam and cut fastballs)
Percentage knucklecurve: 39.3%
Percentage of changeups: less than 10% (8.8%)
Not to discount the number of innings he has thrown this year, but essentially he throws fastballs and curves. He has no change and no slider to speak of that he can reliably throw. The addition of a reliable third pitch is essential to his future success IMHO. When the hitter knows its either a fastball or a curve, he is going to be right half the time. Even the addition of a splitter would help. Thats his assignment this offseason. Same with Rodriguez. Adding a third pitch would make both of them more effective if they can command it. For now, I think he is spent. I do not see a place for him on the immediate postseason roster.