Why would this be a gamebreaker? Cachino is completely unnecessary for further in the game.
Speculatively speaking, the Omertas are going to have a line of succession, official or not. They'll have a leader, he's just irrelevant to anything the player does.
Ok, thanks for the input. However, as I plan to take over Vegas, is there any way I can spawn him because I would like there to be my puppets in place.