Shit is simple he got $$$$$$$$ and a good team with some cooperation the Feds will make a 100 yr sentence turn into 2 yrs probation.
Feds don't give a shit about small time players. They want either famous people to prosecute or big time cats and will do a 10 yr surveillance just to be sure than can get a conviction
I couldn't resist!

But you agree he had to cooperate though right? I'm not saying full out snitching but at least telling what he knew about what they were looking for.