Chain of Memories RE:CoM loophole

this is a spoiler about a boss in RE: CoM....

Spoiler

you know when you fight Zexion, he is in the form of sora? well why wasnt Riku able to tell it was a fake? he said that Xion's Keyblade was fake.... i know he may have thought it was Sora, but it was still a fake. wouldnt he be able to "smell" Zexion, like he did Ansem?

 

Spoiler

For starters, it's not confirmed whether or not Xion's Keyblade is really fake. Seeing Riku's history, he's both the most reliable person when it comes to the KK, and the least reliable person, seeing how he could've just been jealous, or trying to make sense of it all. The KK was his Keyblade, then it was Sora's, and since Sora still has it, no one else should have it.

That aside, Riku had his head toyed with thoroughly by Zexion prior. I don't think he'd have paid attention to such details, if we say he could even properly smell him to begin with, what with the coat and all, and there being Darkness all over.

 

Spoiler

good point... i also considered the Terra, false keyblade with no chain as well, but i noticed Zexion's keyblade had a keychain