Remember, Gotti officially denied responsibility of the hit on Paul to the Commission and to Chin when they met. Of course, Chin knew he was full of shit but he denied, denied, denied. And in Chin's case, he denied having anything to do with a wire tap picked up of Bobby Manna plotting to kill John and Gene Gotti and claims Manna and company went rogue. Of course, Gotti knew Chin was full of shit too. After that it was basically a stale mate. Only person trying to whack Gambino guys after that was Casso on his own.