NY 6436-C-TE was almost definitely Lombardozzi. The informant was a Gambino member who attended Apalachin and spent time in Baltimore. The only five Gambino members who attended Apalachin were Lombardozzi, Gambino, Castellano, Joe Riccobono and Tommy Rava (Armand Simonetti may have also been present). Rava was dead by the point that the informant started talking and Riccobono was inactive. Gambino was obviously the boss and Castellano was already acting boss so that also makes both of them extremely unlikely. That just leaves Lombardozzi. Also take into account Lombardozzi spent some time in Baltimore and had been charged with fraud just before NY 6436-C-TE started cooperating. Lombardozzi is the only one who can be reliably traced to Apalachin and Baltimore and the timing lines up with his arrest. It's almost certainly him.

Plenty of guys provide info at some point then end up doing time later regardless. Like Harry Riccobene from Philly. Talked to the feds in the 1960s, died in prison anyway.