In the hypothetical if Carlo testified and was able to get Tony sent away.....Paulie would be next. Or Patsy. There are probably some other Capos that weren't in the show too on Junior's side that may step up, we briefly see some of these guys at Richie's "homecoming" at the Bing. Albert Barese would be a front runner. His cousin Larry was probably the most logical choice since they said in the show he had the biggest crew, but he's already facing serious time last we heard. Maybe he's the front boss in prison and Albert and him run the Family with Albert Acting Boss till or if Larry gets out of prison.