I cant believe the guy was stupid enough to actually admit his role in the robbery to the Melia's. What did he think would happen?

That witness against him will also be testifying about Melia's claims that he attempted to car-bomb a person in the 80's and supposedly also turned down the opportunity to be made by the Gambino's (??? Would any of these mutts really do that? They spend most of their lives trying to get into that secret boys club, and when they dont, make out like they had the chance but turned it down)

Although the article states that in 06 he was imprisoned on racketeering charges and was accused as a "member of" the Gambino's, but they may very well have meant as an associate, as its what most sources seem to claim.