Suggested by Destroyer Aizen is one of the most powerful Bleach villains out there. The guy can use illusions to keep you guessing for days while also possessing a master level amount of strength and speed. Lan’s really not going to be able to do a whole lot against a fighter like that. Fortunately for him he does have Megaman and the ability to cross fuse. Aizen won’t be able to overcome that level of skill. His illusions will be shattered. Lan wins.
DReager1.com 
Aizen should win this more often than not, particularly in the real world. He’s also skilled enough to make Lan’s death look like an accident, when that would be a lie.
Yeah Lan definitely needs to be careful not to get too far away from Megaman here for even an instant or it’s game over for him