Boi is this project dead? You better not be giving up on me, I had to create a new account and everything. You got your whole 1 fan xD.
By the way I found out that the game registers both as Sora, and I tried to modify the slot to Roxas and what I got is 2 Sora, and a Roxas and they move and attack with the same button In the sense that they take turns, but jumping is fine, should consider doing a hotfix to register attack cooldown is calculated by model and not entity.
Edit: My dude you should consider having both the players be able to take on different models. For example KH2 Sora and KH1 Sora or even Roxas with a Sora moveset modifier (If you to give the ability for different models, I'll post the codes for Roxas and moveset modifiers to allow playability.
Really don't want this to die, so I wish you luck my dude