Well that is a vague qualifier. I think it could greatly improve the 2011 rotation, not in comparison to 2010, but in comparison to what 2011 would be without him. Is Silva going to get 25 starts this year? He could easily suffer a setback after a brief glimpse of decency this past year. Does a guy like him, as good a bet as any of them to give you 200 innings and make every start, make it easier to stretch out Cashner? Dempster, Zambrano, Garza, Wells and Cashner could be a stable rotation that actually provides some room for real upside. And then you let those other guys fill-in where needed. (Gorz/Silva/whoever). Maybe you put yourself into position to trade pitching at the deadline for much needed bats. I think on his own he'd improve the rotation a fairly significant amount. When you talk about cost of prospects though, that could be negated.