The Outfit generally rewards loyalty.

Jimmy I & Solly D. are very capable Outfit men who have done a lot of time in prison and remained loyal.

Jimmy Inendino, Solly DeLaurentis, Sal Cataudella and Frank Caruso (26th St.) are your 4 top men in the Dominent (Cicero) and Sub Dominent (26Th St) Crews in the Outfit. They are the Southern Groups.

There has been a lot of attrition based upon prison.
Jimmy Marcello would have been the Top Boss in the Outfit, but he is never coming back.

Elmwood Park & Grand Ave get mentioned because of John DiFronzo and Joey Lombardo (who is now gone in prison and will never return).

Those two guys retreated from the Outfit years ago. It is their reputation that gets Elmwood Park and Grand Ave mentioned, nothing more.