Oh of course, I'm aware of the whole conspiracy. It's just, there seems to be some sort of concrete dialogue where Caponigro desperately points a finger at Tieri. I just never considered him going that deep in to detail about his partners. In my head I was imaging commission-dispatched soldiers going bar to bar looking for guys who know about the conspirators and are willing to sell their locations for $20. Too much Sopranos I think
On the other hand, your answer makes sense. A high ranking Genovese extracting info from a man blinded by greed is an everyday thing over there.
What was the make of the shotgun used on Bruno? Could be a clue.