Yeah, but you're ignoring that who he was got him to where he was.
Why not ask yermin to do those things now? Because if it ain't broke, don't fix it. That's the thought process of a lot of baseball players. Being a chiseled specimen isn't required in this game to be successful. Swings are fickle things. If he was working hard at his craft, in the cage and on the diamond you're less likely to ask someone to change until the success starts to disappear or there's a reason to.
And an Achilles injury, better yet two, is really just bad luck.