I think I would agree with you.  To-date this season, Iowa has been a "second half" team - they've been able to pull it out the second half.  I would agree Stanzi's injury had to impact the moral of the team, helping to lead to that upset.

I would say there were 3 upsets in Big Ten today:  Illinois upset Minnesota; Northwestern upset Iowa; and Ohio State upset Penn State.  Okay, some would not call the last one an upset; however, I am calling it that.  I will say that Ohio State was the better team today, although I was really hoping coming into today's game that Penn State would come out on top.  Boy, that loss hurt!

It looks like Ohio State is in the "driver's seat" for next week.  If they beat Iowa next week - and the odds of that increase if Stanzi is not in the game - then Ohio State is clearly in front for the Big Ten Championship.