Anyone want to try to explain to me the ending of this series...? Sora gets turned into some armored monster or some shit, and it ends.....

Edit: I rewatched it again and it made a bit more sense. At the very end I thought Tsukasa was Mimuru (sp) walking out of the hospital. It doesn't piss me off anymore, but what happns to sora? Does it just merge the story into the game and everything is explained there?