Well, for starters, he's a very skilled offensive player. He's perfectly capable of stepping out and making perimeter shots, even to 3-point range.
Like most big kids his age, physically he needs to get stronger but that should come in time as he fills out his 6-10 frame. Regardless, he's in there fighting for the tough rebounds and he's very aggressive and that's a great trait to see in a developing big man.
Looking for another reason to like Zeller? Well, his mother played college basketball on the small college level and height runs in the family. Another relative, Al Eberhard, was drafted in 1974 by the NBA out of Missouri after being an all-conference performer. The kid has basketball genes.