Inside the Boxscore, you will note that while Hagerup put up some boomers, Bama averaged 16 yards on the returns. Michigan averaged just over 1 yard on our returns.
So it would seem the coaches were putting the best 11 special teams players on the field, and we still gave up an average of 16 yards ...
It sucks that Blake is injured / out for the season. It would appear that the coaches had good reason to be playing him.
(I would like to see video of the play again to see what happened to him.)