Crumbles moves first in a game round. This means that unless a Hero happens to be in a space between Crumbles and the Music exit and Crumbles rolls exactly the right number to move onto that space, a Hero will rarely start their turn in the same space as Crumbles.You're going to need to pick Crumbles up in order to get him out of the sewer water. He cannot move out on his own. There are opportunities in the sewer because Crumbles will stop moving when he is in the water and can't climb out.
Are the Heroes allowed to pick up Crumbles during their movement?
Or is the intent that a Hero must move onto Crumbles' space first then use Scurry to move with him?