Casso was a soldier who was to be reckoned with. DeCicco and Gravano felt him out, and told him he didnt care what they did, but kept his mouth shut after. Angelo already told them they had approval from the Colombo family which is backed up with the bug recording the meeting, and Gotti said he had Joe Massino of the Bonanno in his pocket, but all evidence points to Joe not having a clue about Castellano, but I think Anthony Spero might have had a clue. The Costello hit was not approved by the Commission, evidence by numerous sources, informants and bugs on the commission member families.