Here's the key distinction: Patriarca and Piccolo weren't charged with crimes related solely to their presence at induction ceremonies. Piccolo was charged in relation to illegal gambling operations in New Jersey. Here's the counts against Patriarca:

Count 1 involving a RICO conspiracy; Count 2, the substantive RICO charge; Count 30, the Travel Act conspiracy; Count 31, the Travel Act violation occurring in August, 1985 involving Robert Carrozza; Count 36, the Travel Act violation occurring in August, 1989 involving Matthew Gugliemetti's travel to Connecticut; Count 38, the Travel Act violation relating to travel preceding the October, 1989 induction ceremony involving this defendant and Joseph Russo; and Count 39, the Travel Act violation in connection with the induction ceremony on October 29, 1989.

If investigators don't have anything against Lancellotti like they do with Mazzone and Grande (i.e., collecting extortion, gambling and loan sharking money from cooperating witnesses and directing them to engage in activities) they are unlikely to charge him. If all they have is the tape from the ceremony then he doesn't need to be a CI to skate on it. Same goes for Ligambi and the other ranking members on tape.