"If you want light to rule over all, then you must rid the world of everything else."
Their places in the timeline are based on the year 3D - 1 AKH - bring the same as Tron: Legacy; 2010. I just worked backwards from there. Because Space Paranoids is a more integral part of the plot in KHII, I decided to add those events in.
Sweet! Though if I were the one designing this, I'd follow a bit more closely to Bulbapedia's Pokémon Anime timelime by adding in what's known about the other worlds as well, but it's up to you.