I dont think DeMeo would have flipped.
He was hatching a plan to fake his own death then flee abroad with his family (according to Albert DeMeo).
The feds would not have given Roy any deal.
Dom Montiglio returned to NY in mid 1983 to extort a guy and got busted where he told all.
The feds also had information from Vito Arena.
Why would the government make a pact with the devil (DeMeo) when they could make a case off the info from lesser men like Montiglio and Arena.
I've always said (and I'll say it again) that the Gemini twins did DeMeo a FAVOUR by whacking him.
If he had lived, 1983 would have been his last year as a free man.
DeMeo would probably be rotting in ADMAX now with Greg Scarpa Junior.

Trust me, Roy DeMeo had the last laugh on Joey and Anthony who are rotting in jail for the rest of their lives.