I really don't have a clue as the number of innings as a predictor of injury, but I think baseball medical staffs are in the same position. There is no solid science behind any of these innings protocols/theories. They may have some statistical studies, but I hate to break it to the Sabremetricians -- that is not science. I would be concerned if I saw a downturn in his performance, but he has been pretty consistent since Aug 1 with the exception of his last start.