I think two things are true about scums offense right now
1) To get Underwood to flip his commitment, Moore promised him that he would not turn him into a running quarterback and would run a pro style offense. The reason Underwood did not commit to Michigan originally as he was worried about his development. Moore had to make this promise to get him to flip.
2) Right now Underwood does not know the all the plays that Michigan is trying to use in any given game (let alone the entire playbook) . I have seen Underwood turn the wrong way on play action pass fakes several times. Add the play where he threw to MaCulley's back (while he was blocking) and then argued with Haynes on the sideline it's pretty clear somebody's not on the right page.
This puts Moore in a box. Does he simplify the call sheet more? Does he hope Underwood learns all the plays they want to use? Does he break his promise to Underwood and put in more QB runs?
Let's hope he chooses poorly.