If he's bigger now than he was at the beginning of the season -- it's steroids. It has to be. You can't add muscle during the season and still manage to have the energy to hit 14 out in a month. The regular season is about mantaining muscle and I don't care how dedicated you are, you can not add muscle during the regular season.
That said, I haven't paied attention to whether or not he's gotten bigger. I'm just saying, if he has, it's steroids.