What people fail to realize is that the Commission respects power.the Boss position is technically an "elected" position. Whether it's by consensus or by force, the Boss has to have the support. The Bonannos were kicked of the Commission because it was fracture and the other bosses didn't have to respect The Bonanno Boss because he didn't have full support within his Family.

The other Commission members play politics to best suit them. Galante wouldn't have been the Boss without eliminating Rusty, Sonny Black and Massino...... it suited the other Families to support Rastelli. He ran a weak operation( in comparison) and they could take advantage