I don't understand why you guys are shitting on Rusty not acting as a leader. He was the president of the DIK on paper only, the one in charge has always been either Vinny or Tommy and now the MC.
Rusty would take care of business related stuff and the alcohol, most of the decision making for the frat he left to Tommy. It's not that Rusty has weak leadership, it's mostly that he does not wants to deal with those stuff. He actually owns to his mistakes and blames himself a lot for what is happening, but he is more aloof and would rather avoid dealing with problems. He don't want to be a leader, simple as that.