Sitting Wagner in 2nd Half

I am trying to figure out the game strategy there, last night in particular.  He was a disaster defensively against Ok. St. and that was an up and down shoot out where Wagner was a little bit of a fish out of water in that game.  I was on board there.  He also clearly has a lot of learning to do with regard to the team defensive principles, positioning, etc. 

However, I did not particularly understand it last night.  He wasn't shooting well but he was at least making Oregon have to contend with a "big person" in the lane, if nothing else, and he was finishing when they found him near the rim.  Robinson also did not play well against Louisville and had jacked a couple of ill-advised shots in the first half last night.  He could not contain dribble drive at all, either.

I understand that this will possibly bring quite a bit of Beilein venom out, and equally as much "he has been coaching for 30 years I think I will go with his idea," but aside from those scorching takes, what was the reasoning there?  It would really be unfortunate if Wagner decided to go ahead and take his talents somewhere where dollars are paid next year, and I don't know if that was ideal timing for whatever clever idea lead to the decision to sit him for that stretch.  Perhaps there was something that I was missing that factored into it?