Hm... I don't know about your pick with the Seven Lights.
I really don't think Roxas and Namine will really become their own person bc they technically they are still par of Sora and Kairi, respectively... even if they do have their own hearts (referring to the KH 3D, I think(?), when it was found out after awhile they can "regrow" their hearts), in some sense.
As for Xion, she's gone. We'll have to all abandon that as hard as it may be.
I think they Seven Lights actually are:
Sora
Kairi
Riku
Ventus
Aqua
Terra ( I am sure he is one of the seven lights bc of the whole keyblade trio continuum they have for the main characters of the series.)
King Mickey
As for Lea being a Seventh Light, sure, I can definitely see that, but back to my comment about the Keyblade trio continuum, I think it'll throw a HUGE wrench into that.. I'm sure that maybe Terra will be saved at the VERY tail end of BBS 0.2, have an epilogue of him being saved or a symbolization that he's back on the right path, OR at the towards the beginning of KH3, he will be saved, along with Ventus.
