I dont think he'll even do that much. Sora never said he hated darkness. Xemnas points out in KH2 that he, Riku and Mickey "accept darkness yet choose to live in the light". I don't think Sora will need to confront any darkness of his in KH3. I could see him having to confront the darkness of those sleeping inside him though. Gotta wake them up somehow. =D
I hope not. No more star war stuff. TnT