From what I have read Gigante was in Castellano's ear telling him the rules were Quack had to go.It certaintly seems from the wiretaps I have heard that Dellacroce was getting ready for war with Castellano.Neil was in a bad spot he knew Castellano was right but he wasn't about to let Quack and Gotti go.Even Demeo was planning hit on Big Paul before he got it. Castellano was a dead man walking it just took a couple yrs to develop.