Why can Riku hold the Keyblade?

Why can Riku hold the Keyblade? New member. During KH it was implied that Riku was the true Keyblade master and that it went to Sora only because Riku had turned to darkness at the time. But then we find out that not only are their more keyblade users, but the reason Riku was meant to have one is because Terra performed the inheritance ceremony.

New member. During KH it was implied that Riku was the true Keyblade master and that it went to Sora only because Riku had turned to darkness at the time. But then we find out that not only are their more keyblade users, but the reason Riku was meant to have one is because Terra performed the inheritance ceremony.