yeah, Zeller is slightly better. But better none the less. He's just so passive, and generally a step behind the action. He will get better. But he is not a leaper or very quick off his feet. He is a back center.
Obviously Sully and Kelly are not the answer on the defensive end, Sully has hope, paired with an long athletic center that stays at home in the paint, and I think his short coming will be somewhat covered up. He will always be a solid rebounder/scorer in this league.
Unfortunately we have two interior players that can't defend, can't leap, don't move their feet well, react slowly, and are young to boot.
Kelly O looks like he lost his dog, he's sad and lost in general, now its starting to effect is offense.