Lol, Gotti did actually say that "maybe the cops killed him" statement. Based off that alone, it's obvious no one who had the authority approved that hit. It was family thing, and I think once it happened, the majority of the bosses just rolled with it, but were willing to follow Gigante's lead, as he ran the Commission at the time. Once once the bombing attempt failed and DeCiccio got it, I think Gigante just moved on. Probably knowing another dead mob boss wasn't good business during that time in NYC when LE really began to stick it to the families.