Show me where it bluntly says that. Nothing is for nor against it.
Because he became Rikunort so obviously he would be able to do all the things Ansem SoD could do plus wield. It's not that hard of a concept.
And it's also been said by the people who do Kh that it's close to a Keyblade, so >.>
And yet he was able to open RG's door to the world's heart. I'm sure he knows he has a Keyblade. I see nothing where it seems like the first time he's seen it. He's seen it before that when he became regular Xehanort. You know, Aqua's armor and such.
Yeah, and only a Keyblade kiddo could do that. So whether or not he used it is debatable, but the Keyblade itself is there and able to be used. So even if he didn't use it, it doesn't mean Riku couldn't.
And yet he already had an encounter from his own memory. So perhaps a retcon/change in information about Mickey? I think so.
Because it's not like I did.
Oh wait, I did.
And why would Nomura show Riku pulling out such a grily Keyblade if he wanted to put emphasis on the fact that it he wanted to show that Riku gained the keyblade form Xehanort. And why would he show Aqua using a keyblade of the SAME design made from the connection of her bond with Kari if it was even remotely connected to Xehanort.