The nail bat, you say? I don't even think I ever used it, unless learning all the weapon abilities was part of 100%. Thing didn't seem very Cloud-like (yeah, I know it's in the original too). Tell me more about how you can break everything?
Friend of mine was using the nail bat primarily in his game and he just kind of tapped out around Chapter 14 or so, don't think he even climbed to the tower. Said the fights were taking way too long (on Normal) and it burned him out. Maybe if he can break the game with his bat he'll actually pick it up and finish it.