My guess is Dekker to avoid foul trouble for Kaminsky who Wisconsin can ill afford to lose as evidenced by their loss to Rutgers without him. He'll undoubtedly send either Willie or Karl to the bench with 2 fouls in the 1st half, perhaps both. And he's a 75% FT shooter. It's likely we'd need Dakari and Marcus to really step up in that game.
I certainly think UK can, and should beat Wisconsin, but another concern is with they style they play it could very well be a 1-2 possession game in the last minutes much as it was last year. In that kind of game, particularly in the NCAA tournament anything can happen.