Good question. I will compare the Athletic Testing Composite Ranking with two other big men we're considering.
Kanter ranked 34th, Chris Singleton ranked 15th and Derrick Williams ranked 17th.
How can you consider Singleton and Williams to be big men?? Williams MAY be able to play PF, but has said he wants to play SF. And with a standing reach of only 8' 7.5", I don't think Singleton has a prayer at playing PF. And clearly neither can play center, which Kanter almost certainly will be able to do.