now we know terra is not xehanort, and the secret movie is in the past.
UEM might be xehanort somehow become young again, or taken xehanort's body(as the same that ansem did to riku). but he had lost the memory and become the student of ansem the wise but when he study the heart(u all know what happen to him) he had turn in to heartless and nobody, the heartless might be UEM, the UEM might be in his heart that why when it turn to the heartless ansem, it have the same cloth because i dont think it a coincidence that the cloth look the same, the UEM did summon the kingdom heart like i say him might forget his memory when inside xehanort and turn to heartless and he was seeking for the kingdom heart. the nobody which is xenams his goal is to find his heart(or to have a heart) and become complete. xehanort should be on terra's side as in the ES fight terra did say xehanort and he is the one chosen by terra for something.
it all just theory and could be wrong so say anything u like, and sorry for any grammer problem
UEM might be xehanort somehow become young again, or taken xehanort's body(as the same that ansem did to riku). but he had lost the memory and become the student of ansem the wise but when he study the heart(u all know what happen to him) he had turn in to heartless and nobody, the heartless might be UEM, the UEM might be in his heart that why when it turn to the heartless ansem, it have the same cloth because i dont think it a coincidence that the cloth look the same, the UEM did summon the kingdom heart like i say him might forget his memory when inside xehanort and turn to heartless and he was seeking for the kingdom heart. the nobody which is xenams his goal is to find his heart(or to have a heart) and become complete. xehanort should be on terra's side as in the ES fight terra did say xehanort and he is the one chosen by terra for something.
it all just theory and could be wrong so say anything u like, and sorry for any grammer problem