Ok now for a thought, i worked out that Xion DOES have a connection to Riku because when a nobody is created, they get created by the last thought of a user's memories, Hence why Xion was created. She was created becase the last thing Riku was thinking about before fudging off to darkness was Kairi.
Also another thing that came to mind was that Xigbar knows way too much about Terra, Aqua and Ven. For one, he has an astonishing resemblence to Master Xehonart, minus the hair. and secondly, he was one of the 6 apprentices along with Xehonart, Ienzo, Dilan, Even and Aeleus.
My third point is that Xemnas says "Mabye im all that's left, or mabye im all there ever was". Now if we add Xehonart to this. Look at The name Xeohnart, and take out the X and rearrange it, to reveal Noheart. So maybe Xehonart was a heartless and Xemnas, (who is also Xehonart) was a nobody to begin with.
If you have anything further to add then by all means go ahead, but im only using what ive been thinking of, as its just a speculation, and not a full blown spoiler
Also another thing that came to mind was that Xigbar knows way too much about Terra, Aqua and Ven. For one, he has an astonishing resemblence to Master Xehonart, minus the hair. and secondly, he was one of the 6 apprentices along with Xehonart, Ienzo, Dilan, Even and Aeleus.
My third point is that Xemnas says "Mabye im all that's left, or mabye im all there ever was". Now if we add Xehonart to this. Look at The name Xeohnart, and take out the X and rearrange it, to reveal Noheart. So maybe Xehonart was a heartless and Xemnas, (who is also Xehonart) was a nobody to begin with.
If you have anything further to add then by all means go ahead, but im only using what ive been thinking of, as its just a speculation, and not a full blown spoiler