Sal Polisi is pretty credible at least more than hill. Tommy was fucking and beating up Foxy's sister which is what caused foxy to threaten to kill tommy and then tommy being the nut he was killed foxy. In december of 78 gotti came to see sal and told him that it was time to take tommy out but sal didnt want to be involved. Now i dont think sal ever said that gotti was the triggerman but he did say that gotti orchestrated it and might have been present. Im sure angelo gene and even tommy agro who knew desimone was involved