It never made sense to me that Profaci was involved and that Gambino handed the hit out to outsiders instead of his own guys. Capeci's theory makes a lot more sense.

Not to mention that Profaci was close to Bonanno who in turn had a good relationship with Anastasia. I think the theory that Profaci was asked to organize the hit and then selected guys who he wasn't particulary fond of is laughable.

It's only common sense that Gambino used his own guys to carry out such a risky operation. How would it look like to others in the family that Gambino was dependent of outsiders? It would have appeared as weakness and having a lack of support. For this very reason Vito felt strong enough to take on Costello.