Chain of Memories Scents?

Ok one of Zexion's powers is obviously heightened sense of smell. What he really is smelling though is the darkness or light attached to a person's heart. When he stated Riku smelled similar to their Superior, it was because Xehanort's Heartless was still leeched onto his heart. Riku, because of his stint in the darkness, also has this sense of smell, but it's not as acute. This is because his darkness was tempered by Xehanort's Heartless. At least that my view of it.
Hope this helps!!!

 

i agree that Riku's 'scent' being like Xemnas' has to do with his heartless having influence on Riku. but Zexion isn't the only one who said it...I'm pretty sure Riku mentioned something about scents too. i always assumed that it was a translation thing and what they really meant was that they can 'sense' a person's energy, and not literal smell. otherwise you could beat Zexion by immobolizing him with a powerful smell! (lol...that would make a good parody)

 

*cracks up*
Oh man, that would be great, write it. I'd read it.