I'd put Kanter on Howard early and see how he does. He seems to have had success in the past against power type players who aren't as skill or footwork reliant. Plus, getting Kanter in foul trouble is much more preferable than having Favors in foul trouble.
Most definitely. He's pretty good guarding those dudes because he doesn't have to move. They're gonna make him defend pick and roll when Harden's in the game.