C'mon guys - he's a beanpole. Do you really think he's gonna go to UNC (or whereever else) and dominate his first couple years? He'll be a nice player, but don't lose any sleep over this one. If he's the 16th ranked player in the country, the class is very, very weak.
Ask yourself this: If Zeller wasn't ranked no. 22 or whatever in the country, would you really be excited about him. I'm sure he's a fine player at the high school level, but I'm not sure about his potential at the collegiate level.
If he comes to IU great, but if not, it's not the end of the world.