Sully is what he is, he'll never condition himself properly. Why should he? He'll make millions just like he is. At 23 years old Sully is a career backup center. Too heavy, to cover all but the slowest power forwards. Too short to have an impact against the taller, longer centers in the league. He uses his bulk well, and has some skills, for that reason he's a decent short minute backup center.
Will he lead this team anywhere? yes... to the fridge.