"He lost many pounds and bulked way down before the start of last year's spring training."
You mean when he couldn't train with heavy weights because of his shoulder injury? You're going to have to a LOT better than that.
You don't lose that much weight and muscle mass in a short period of time for not lifting weights.
You're going to have to a LOT better than that.
Not really. Just look at Barry Bonds enormous head to know he did the stuff.