I think that maybe the Mafia paid for his education so that they could have another "connection" in law enforcement. And he would definitly owe them if that was the case. Any thoughts?
I wondered if it could be something like that, too. My only thing is that being funded by the Mafia would pretty much ruin him. At least, I would think it would. I mean, that would saddle him with a major appearance of impropriety at the least. And Mac would certainly have difficulty trusting him.
I do think, though, that maybe they let him leave the TB alive because they figured that on down the road, they could use his past to get him in their back pockets. That's probably what Sonny is counting on.