The fact that grappling enemies can rearrange my party through Immobilized has created some frustrating situations where I start a battle with an immobilized character in the front position, only able to attack from the front... then my ranger gets grappled to the front, and there's no way to get either character back to a position where they can act. (Or to move anyone else, for that matter, because an immobilized character in the middle blocks nearly all non-grapple movement.)