I think Teddy DiPietro went into WPP because he went to the cops. Chuckie Merlino scared the shit out of him at Bookbinders where he worked and he went right to Frank Friel and spilled the beans. I believe Casella spent his long stint in prison with higher ups in the Genovese and whatever relationship(s) he developed in the joint essentially got him
A pass to get shelved...