I think he would have gone to very far lengths to avoid imprisonment; the fake death involving the son and in particular, the fleeing to a foreign county shows this.

I think the Feds could have flipped him, not in the beginning, maybe during or after trial (in which his testimony would have meant less and less to his case as the trials went on) but definitely when they convinced him of the life his children and family would live once Roy's imprisonment. He wouldn't have flipped like Gravano or MIkey Scars but he would have flipped like Massino.

Shit, even if the guy had no children or wife, it'd be hell being one of his co-defendents. Hell, if I had 26 murders I was lookin' at in court, I wouldn't want DeMeo as one of my co-defendents.