I'm not gonna proclaim to be an expert on the Hoffa situation. But to quote the Gambino underboss Neil Dellacroce (speaking generally of alot of people) " he doesn't understand Cosa Nostra". The Hoffa hit effected to many people for ANY Family to just decide they were gonna kill him. All due respect to Detroit (I respect the Organization) but if Albert Anastasia and John Gotti had to make up stories and alibis when they killed there Bosses, what makes you think, Detroit had the balls to whack Hoffa, without approval. The mob is ultimately about money and getting the most of a deal. Hoffa "going", had implications on the mob as a whole and had to be more beneficial then keeping him around.

I'll use this analogy, of course I know its not about Bonanno but I use this to explain Cosa Nostra politics. I often hear people who claim to understand Cosa Nostra make the statement "I don't know how he survived?". Its simple, because it was a powerplay and not the narrative we know. Do you really think someone could put a hit on 4 or 5 Bosses and Survive? Absolutely NOT. It was a powerplay to remove someone who stood in there way and it benefited enough people to play along. I use a theory called "Pattern Analysis". If you pay attention to the patterns of Cosa Nostra, you find the same reoccurring results and hardly any variations (this theory applies to everything). Theory: If you do this (cause), then one of these two or three thing are gonna happen (effect).

Long story short, with that being said, Hoffa was hit, it was approved by multiple Families, and I'd go a step further, moreso then Detroit acting alone, if they tried to protect Hoffa (theoretically speaking) and the order came down from New York, he would go! Period. Nobody (back in the day at least) os bigger than the Commission.