Would have been definitely interesting to Jackie Sr in action, but from what we saw is that he was a calm and powerful leader that made Junior and Tony stay in line, which says quite a bit. Based on what we see know of Tony and Junior, both were probably deemed too cowboyish by DiMeo's point of view and may draw heat from the Feds, local bulls, or other rivals.

Jackie seemed to be even keeled which is what you want from a leader.