Maybe I'm a little behind in the times, but I found another reason for the white textures.
Again, maybe you all already know this, but if you try to use Dreakon's higher quality cloud mod with this, it causes the white textures. I tested it by using a fresh battle.lpg, then adding your weapon texture mod--everything works flawlessly. But if I then apply Dreakon's cloud mod, the white textures are back.
Now I have to decide which I like more. So I'm guessing you have to use an unmodded cloud or APZ cloud to use this pack?
EDIT: And while I'm at it, I had a quick question. Which files are for Cloud's Buster Sword and his Ultimate Weapon? I liked to replace the UW with the Buster Sword on the PSX just because the BS is his iconic weapon and the UW is too--garish. Would I be able to just copy the Buster Sword's file and rename it over the UW to accomplish this? Or is it more involved?