Something from the other topic

Back when Days was made, we were still under the impression that keyblades were in some way special

But they're not, they're just fancy, but man-made, swords

So knowing that... what makes Xion's keyblade a 'sham'?

I always had interpreted it as being a man made copy... but keyblades are man made

It's not any weaker than a normal keyblade. It can still change shape, it can still collect hearts

What about it defines it as a fake? I assume it can be destroyed, like Data Sora's keyblade? I dunno

but literally nothing we've seen makes this keyblade less valuable, though I'm curious when Riku became such an expert on the subject in the first place, now that I think about it

 

What about Mickey?

 

That's true, I forgot about Mickey...Anyone besides Sora and Mickey then (even though my argument comes across much weaker now ).

Ah, okay. Man Nomura really needs to stop explaining key stuff like this in interviews

 

Again, that works from an outsider's view

I highly doubt Riku saw the keyblade and thought "Hm... this must be created from the siphoned power and memories of Sora's Nobody"

granted, he might have, during his blindfold phase Riku seemed to know a LOT of stuff for no explored reason

Riku once wielded the power of the Keyblade specifically he once wielded Sora's Keyblade. I'm pretty sure once he held Xion's Keyblade in his hand he would have been easily able to recognize that not only that Xion's Keyblade was not only a fake but that it drew from Sora's power(via Roxas). Even so what does that even have to do with your main point?

He actually meant that it's a shammy, in that you use Xion's keyblade to help wash dishes.