I think it is more that last year we felt like we were cheated and deserved the Big ten title and so our team put so much focus on winning the Big ten Tourney to show everyone who was really the best team in the league. we then accomplished that goal and sort of lost the "eye of the tiger." We kind of felt like we were a #1 seed and did not have the mental drive to get through and win the second round game.
I think Iowa did the same thing (except maybe not show they were the real Big ten champs but (in their mind) show they were the best team in the conference. Also everyone stated they were the hottest team in the country, (which they had won a lot of games at the end of the season) but the their schedule was fairly soft the last half of the season with wins coming against (in order): Minnesota, Maryland, Nebraska (lost to Michigan), OSO, MSU, Nebraska, Northwestern, Michigan, (lost to ) Illinois, Northwestern, Rutgers, IU and Purdue.
That really was only about 3-4 good wins.