Let's go over everything again summarized.
The note that was read leads up to this scene where Riku, Sora, and Kairi are now chasers searching for the lost two keyblades. Xehanort which stands for no heart is an unknown who may be referred to as master of the keyblade.
This takes place in the future where a keyblade war is going on.
The weapons around them are not keyblades they are swords.
All three knights are dual wielding keyblades.
Mickey's keyblade is being used as well as Sora's.
There are 6 confirmed keyblades in that part.
The dark figure who may or not be Xehanort is wielding two weapons or actual keybllades.
Roxas is within Sora thus he can't be one of the knights.
Xehanort may have been around when Diz was an org member.
If the dark figure is wielding keyblades there are 8.
The tallest one is Sora because sora is always shown in the center of Riku and Kairi.
Kairi is the shortest knight.
Riku may be the one with his horns pointing backwards.
Riku is taller than Kairi.
Sora opening the door of light may have caused all this.