Yes but the problem with this theory is that Xehanort is about the same height as Master Xehanort and Terra. In the secret ending we see Terra about to attack Master Xehanort and his apprentice. We saw that the apprentice is 1 head shorter than Master Xehanort and notice the scene that we see in KH2 when Xehanort is whole. It takes place a couple of months after BBS and how can someone get that tall in just a couple of months? I mean wow. It's not likely but who knows. And if you don't get what I'm saying about the height. Click on this link: http://www.youtube.com/watch?v=am3rfpmrwEo Now go to 0:29 compare the height to Master Xehanort & DS. Also Xehanort [the 1 we all know who's been an antagonist in every game] is about the same height as Master Xehanort. So yeah. That's the major flaw in the theory about DS= Apprentice Xehanort.
Recently I have seen 1 pic about the Coded Unknown and another on the trailer. I think there may be more than 1 Coded Unknown. 1 of the Unknowns resembles Xemnas [due to the height and stance] while the other resembles Roxas due to his shoes and height. He might also be Ven as well. http://www.khinsider.com/images/riplai/scans/riplai12.jpg
Xehanort's apprentice or known as the Dark Soldier[DS] is probably the most engima character next to the Master of Aqua, Ven, and Terra. The Dark Soldier is NOT a heartless. They weren't made until a year after BBS when Xehanort created them so it's not a nobody either. It's not Braig. He was an apprentice for Ansem The Wise at this time. He experienced it as the other 4 apprentices did but he is NOT I REPEAT NOT DARK SOLDIER. They have too many differences and DS' is really short. Braig is pretty tall as well. DS' is about Ven's height which is a head shorter than Xehanort, Master Xehanort and Terra. DS is probably maybe not even a man. He might be an IT. Also we don't know who Master Xehanort was talking about during the time in a video when he said "Already that man is a monster infused with darkness. Defeat the Darkness! Correct my mistake!" He could have been talking to Dark Soldier his apprentice saying to defeat Ven because he might have done something to him [hence Terra saying to Master Xehanort asking him "What have you done to his heart?!"] So yeah...I honestly think DS + MX+ Terra= Xehanort. Terra and Master Xehanort are too similar for apprentice Xehanort to just to be left out. Same body structure, same height, hair style, pointy ears like Master Xehanort so ya. Dark Soldier also might have turned on Master Xehanort BUT they seem to be buddy buddies around the secret ending [which Nomura said it takes place around the end of Birth By Sleep]. So ya who knows?
