Wrestling will be the difference in this fight. If Kampmann can stop Hendricks takedowns, Kampmann wins. If he can't, then Hendricks wins. I think Hendricks is a smart enough fighter to know that if he's not winning the stand-up, he's got the wrestling to back him out of trouble.
Thing is Kamp's ground game is miles ahead of Hendricks'. He's perfectly capable of reversing him or submitting him off his back.