To what do you attribute the loss of velocity? His velocity was a weapon that he knew how to use. At times he seems lost without it. It's like he is surprised when throws a fastball and it barely tops 90.
Drive certainly comes into question, but I really do not like the fact that someone decided that his body needed a change because it might break down. Well, guess what, his brand new body just broke, he was placed on the 15-day DL with right knee inflamation.
Healthy or not, his overweight body worked for him and he did not have any major issues with it or with his performance until some genious decided that he should be 'fit'.