A ; The Cloaked Schemer I THINK
\Sora was able to wield the keyblade because Riku choose to use the darkness and the keyblade choose to have him as the wielder instead because sora had the heart of a keyblade bearer
becouse sora had the half of ventus heart in bbs as the light keyblade holder riku i beleive got vanitus aside with terra how became ansum and thats also why roxes came from sora when sora went to sleep ...

Q ; how many times you fight sephiroth in all kh ?