Chriss doesn't really play good interior defense or possess good shot blocking ability to be a rim protector. If you think Chriss has rim protecting ability watch when he's been used as a Center and how easily teams are capable of driving on him. He's not good at manning up and stopping people. He gets his blocks swooping in from the weakside and that's what gets seen on ESPN and the highlight reels. Bender plays much more consistently on the defensive end, with his hands up and staying in front of his man.