First of all everyone has this theory that Sora is part of the 7 lights, but a closer look to the newly translated and subbed videos say otherwise.
Xehanort said the X-Blade was split into 7 Lights and 13 Darknesses a long time ago. But Sora can't possibly be one of those seven. Why? Because he originally wasn't fit to wield it in the first place. The only reason he can is because he is borrowing his friend's strength according to (Braig/Xigbar)-nort. Literally, he's using Ven's power to wield a keyblade. So if he wasn't originally destined to hold a keyblade, he couldn't have been one of the 7 Lights because they were destined to be keyblade wielders. (This whole destiny thing is big because Xehanort talks about it in the end and that destinies are fixed, but Lea proves him wrong and therefore Sora changed his destiny by connecting his heart with Ven.) So basically, Sora and those who originally was him Roxas and Xion can't be any of the Lights. The Lights already had the capacity to hold a keyblade from the beginning, when the X-Blade shattered.
So who are the 7?
Terra, can't because his body is a vessel for the 13
Eraqus' body is yet to be found, in fact he isn't even mentioned in any other game besides BbS. His body could be a vessel if not already.
Roxas and Xion don't have bodies.
Yen Sid has renounced his title
Namine is in Kairi, but also deeply connected to Sora.
The Master (Eraqus' and Xehanorts master that is mentioned in Xehanort's Letters and Reports) I don't think he will be introduced.
A possible one is Xehanort, from a different timeline. Remember, destinies can be changed. So what if one of the Xehanorts from a different realm was good. It would be a big surprise to MX and a complete irony. I know it's far fetched, but it would be nice to have a sort of redemption.
Anyways, who ever the 7th light is, Sora will still take part in the final battle. Why? Because destinies can be changed. The prophecy did say for 7 to fight against 13, but it didn't say no one else could participate.
So I imagine Sora to make a hero's entrance helping them out in the middle of battle.
Where was he?
Off on his journey. Remember, he wanted Roxas to be his own person, and maybe his journey might have finally done it. And not only Roxas, maybe even Xion, who is the character that has been the most unjustly treated out of all of them. Maybe since Namine is connected to Sora, she might also have been made into her own person.
How is this possible?
Some nobodies have the capacity to grow hearts. I'm sure Roxas and Namine are two of the few.
What about Xion?
She's a replica of Sora, but nonetheless, if Nobodies could grow hearts, why can't a replica?
Riku Replica, he was made to fight for the original Organization 13, paricularly by Vexen. But Vexen, or should I say Even is a good guy or at least not on Xehanort's side anymore. If Even gets a good ending, RR should too. RR isn't a nobody, but he's a replica, just like Xion and he was just an innocent victim in the Castle Oblivion incident.
Data Sora and Riku, although they don't really need their own body, it would be nice if they helped just during the fight. If you really wanted them.
So Sora comes to save them and evens the playing field. And one by one they show up.
It would be nice if Sora was a Light, but based on the information we've gotten, he shouldn't be.
Edited by StrongHeart, 02 April 2012 - 06:00 PM.