As far as Garcia, he fooled ONE GUY. A desperate old man who, for all of his faults, would have seen right through that fat fuck if he was twenty years younger.
All respect to PB I do think this is simplifying what Garcia did.
He got in with Greg's crew. Hung out with ALOT of wiseguys. Hell, NOBODY in Gregs entourage called him out.
So yeah Greg in his younger days may have picked him up. But
Nobody in Greg's crew said a word either.
So IMO Garcia fooled more than a dated ageing old gangster.
Was it 1970's NYC? No, but it was also more than one old dinasaur...