I'm just knocking ideas around. I figure the og games had the main cast split up in pretty much every main line entry. Sora and Riku were on separate journeys in KHI. Sora, Riku, and Mickey were all on different paths in KHII that all ended up coming together in the end. 

I think as long as we check in regularly enough it shouldn't cause too nuch trouble. Plus we can stretch events out a bit longer when needed while also expediting other parts that run parallel to the games (ie - Wonderland gets a bit more time givem to it, but the group only has to go through Olympus once (as opposed the 3-4 times in game.