On reflective thought Persico has been boss since 70s regardless of being in pen or not and has had blood in power for him whilst he’s inside (even Orena was a distant cousin funnily enough!). Remember in lcn for all these guys what’s more important - the good of the crime family or their own personal interests? With that in mind snake has done the best he could of. Kept power regardless of anything and that’s what matters most as a boss. Why would he step down and let some other sociopath make money, this ain’t a government job.

Persico main 2 mistakes was not taking a plea on the gun possession charge or something back in the 60s which ended up costing serious jail time. and the other mistake was unavoidable - trumps lawyer wasn’t failing in the commission case. All bosses had to fall there.