In reviewing these and other rules in advance of Gary Con (because people always seem to pull crazy stunts in convention one-shots), I have some thoughts and questions. Any insights are welcome!
1. If you grapple successfully, but the target's failed save is not by five or more, what's the situation? You are tangled up, subject to damage from certain weapon classes, but unable to do damage? I suppose you have at least "held" the enemy, preventing him from attacking others? If preventing him from attacking others was irrelevant, what's the situation then? Disengage and attempt a better grapple? Assuming you want to continue grappling, I guess that's the only option, otherwise you're stuck taking damage, but not giving any, right? This seems to make sense and imitate wrestlers, locking up, splitting and re-locking. Obviously this combat maneuver's not always meaningful, especially against dungeon monsters, but I could see it happening in a barfight or something.
2. If you overbear successfully, that means what? That you have toppled and pinned the target, such that he is unable to move/attack? Or is the overbear one roll and the pin a separate roll? If it's a separate roll, what is it?