Hmm... this is very interesting... yet more confusing. The original theory of Riku was that he shielded his eyes from the light by using his blindfold, but that opinion was quickly squashed because Riku is now Twilight and not affected by light. So, I had ruled that that this entity was not Riku. Then, I came up with my own theory, thinking that this strange blindfolded unknown was Dark Riku. Of course, I scratched this out quickly, for I could not find a logical way for Dark Riku to have returned after getting destroyed in CoM. After thought I pretty much thought B.U wasn't Riku, but now this theory arises, and I am as confused as ever. After I've looked into it I'm sure I'll be able to conclude whether B.U is Riku or not. This theory is very logical, however, and it' starting to look like Blindfolded Unknown really is Riku. I might sound super late, but that's only because I never thought B.U was Riku in the first place.