first off kotsay isn't hitting. .235 for the playoffs and that is after a 1 for 3 night. He has had a couple of multi hit games and a bunch of 0 fers
As for an ace, no k's don't matter. IMO it is wins and the ability to keep your team in the game. You quantified it based on the past 2 seasons. Shields has a slightly better winning %, but kazmir has the better era. If both pitchers are 100% healthy, and I have to chose one of them, it would be kazmir no questions asked. He is the face of your staff. Just like Beckett is of the sox. Both had off seasons, both have had horrible outings throughout the year, and both started the season on the dl. If you are a veteran like both of them are and your spring training is all ducked up due to injuries, you break your routine. Both of them have lost command of the fastball this year and both lost the touch on the outpitch. The only concern I would have for kazmir is the workload he has pitched on such a small body at such a young age.