Stanfa made Joey Ciancaglini his underboss in an effort to appease Michael Ciancaglini & Joey Merlino, and to try to bring about peace, as a way of bringing them together by having a mutual link. Which goes to show that at some point Joey & Michael had to be allies, if Stanfa thought making Joey Jr his underboss would help keep Mikey & Merlino at bay. Under this arrangement is how Joey Merlino & Mikey Chang were made into the Philly Mob in the first place. That fell apart though, I don't know exactly why or how as that is for the large part still a mystery to me.