Also, Im sure there are others that share my theory about Massino:

They didnt really need him to flip as his information he brought to the table was already known-mostly anyway. Im sure he brought some good new evidence and helped solved a few past murders, but largely the Feds had alot of what they needed on LCN. Most of the people Massino could implicate were implicated by Sal Vitale and the others that flipped and the people Massino had stuff on were either dead or in the can for life.

In other words:

I think the feds gave him a deal so they can show LCN that Bosses cannot even be trusted anymore. It was a huge blow to LCN in that sense. Also, they want to puff their chests out " We flipped a boss"

Again, this is just my theory, but who knows. I have nothing credible to back any of the above statements.