Honestly his best defense really is that if he was going to cheat this is a drug you don't use to cheat. Like no one is this stupid to be caught using this drug when there are so many better ones to use that don't stay in your system.
People on the outside probably don't realize how good he was last year thinking he was this amazing player when really he just had a huge BABIP. Its not like his BB, K and ISO numbers were even that much better than before.