Well, if he's going to go around trying to discredit other people's opinions and ideas just because he personally doesn't agree with them, and then tries to claim that his opinions are backed by "proof", I think someone needs to call him on it, since he's presenting fallacious arguments...
You make a good point about DD and ASAD being relatively old, at this point, and that they're not gospel. But it's pretty clear in ASAD that it is the dual-wielding unknown who asks "Where's Sora?", right after the blindfolded unknown pulls his blindfold off. ASAD shows the dual-wielding unknown, with his hood over his face, in a facial closeup, who then mouthes something, and then the screen goes black and it says "Where is Sora?", so I think it's fair to assume that it's the dual-wielding unknown that is asking that, right? I just watched ASAD again to verify, and that's exactly how it happens.
Sure, Square-Enix could've decided to change the story since they made ASAD and DD, but going on what we have now I don't think it's so far-fetched to assume that the dual-wielding unknown (who we now believe to be the BHK, based on game footage from KH2 that shows the BHK wielding the same two keyblades) is trying to find Sora. Whether he's asking the blindfolded unknown or someone else is a more debatable topic...