Alright, I was just watching Deep Dive again, 'cause I felt like it. There are four keyblades in the short clip. There's the two that the dual-wielding Unknown has in the beginning with the Oblivion and Oathkeeper keychains. Then he throws the Oblivion up to Riku. If you look closely, as they pass you see that after throwing that Keyblade up, he took out a Kingdom Key. Then Mickey comes down from the sky doing fancy flips and lands on the top of the building with his inverted Kingdom Key keyblade. So that's four.

However, I decided to try and pause during the 13 points to read what all the little clips were, and one mentioned the third keyblade.

Why would they comment only on the third keyblade if there are four? On top of that, this doesn't include Sora's keyblade unless one of those four is Sora's keyblade.

It's been mentioned that at some point in Kingdom Hearts II, Sora's journey would end and a new one would begin. Because of all the mystery behind the blonde guy with the two keyblades (with keychains that belong to Sora mind you) who is, as far as I'm concerned, undoubtedly the dual-wielding Unknown seen in Special Secret Scene: Another Side, Another Story and Another Side, Another Story: Deep Dive, is this second playable character they hint at.

I've also heard that Sora gets some dual-wielding action at some point, though this may just be a part of the Drive ability where Sora merges with another character for special attacks.

So, if the two keyblades that the blonde kid has are Sora's keyblades, how did he get them? I doubt Sora gave them to him, as the blonde kid, many times, mentions that he is looking for Sora. Why would he be looking for someone he's already found?

I'm probably looking into this too much too early, but what do you think?