So who are the people in a:c. I’m talking about the guy with short white hair and the guy in the wheelchair.
I myself believe that the "mystery man" is a clone of sephiroth, one of the numbers after XIII. But if ya think about it when you were in nibelheim and the guys hodded in black robes were walking around. you were able to check the numbers that were tatooed on their arms, since sephiroth was I and Red/Nanaki was XIII the hodded people were II – XII. But where all the numbers there? where there 12 people hodded in black???? Is the mystery man between 2 and 12. but if ya saw the new pics there are three in one of them, so there are three clones????
Next point is the wheelchair guy, many people ( i myself ) reckon that he is the damaged form ( both mentally and physically ) of sephiroth after the end of FF VII. Which is why the mystery man worships him.
But if ya think about it, maybe he is simply a fan of sephiroth.that found him washed up from the lifestream after the fight( like cloud after the weapons awoke ) and cared for him, he may have thought that the only way to impress sephiroth would be to find and kill cloud.