There can't be a second positive if there wasn't a first positive. I think there's more than "Braun 15-20" in Bosch's scribble pad. There has to be for Braun to fold up the tent the way he did. After the summer of 11 there's no way Braun cut's a deal if he never took anything.
MLB is a joke though. The day they "leaked" the info they would be looking for a 50 gamer based on the new info and another retroactive 50 for essentially lying about not using them essentially amounted to 100 games for never actually failing a drug test at all. It was a mind numbing case of WTF.
I do think Braun took something and realized MLB was never backing off until they suspended him for something. So he cut a deal for the rest of 2013.