REGISTER TO REMOVE ADS
You mean play Reverse/Rebirth again. I wouldn't reference it by saying CoM if I didn't play it.
Maybe, but it doesn't seem like we'd learn everything that Riku did in KH2. And it's not really about Riku; it's about Roxas and Xion, along with the rest of the Organization.
I also doubt they would explain why Riku had his own Keyblade ONLY near the end of KH2. He had Soul Eater up until TWTNW.
I'm forgetting something, but I'm not sure what.
And, yeah, even that would have been great. I just figured that, since Roxas had no emotion, there would be some antagonistic aspect to him at the very least, rather than him just being more or less submissive.