Tyler Zeller is in one of the most interesting and difficult to gauge situations currently with the Boston Celtics. Zeller has shown the potential to be the exact kind of center they are looking for but he also hurts the team in the worst way possible.
Offensively, the Celtics could not be happier with Zeller but defensively they could not be more concerned.
The reason why Zeller probably does not have to worry that much is because of how young he is and because he still has a ton of potential to develop physically in order to boost his defensive game.