In the final battle between the thirteen xehanorts and the seven lights does there have to be exactly seven people fighting for the light or can there be more? e.g. Mickey, Sora, Riku, Kairi, Aqua, Ven and Lea, be what are technically the seven lights but then Roxas or Donald and Goofy can join in the fight too.
Also even if there have to be exactly seven lights that doesn't seem to prevent Lingering Will from joining in the fight as well seeing as he doesn't have a heart and therefore isn't technically on the side of light or dark. This last part seems especially plausible seeing as he seems to just be wandering around the Keyblade Graveyard looking for a chance to destroy Xehanort.
In the final battle between the thirteen xehanorts and the seven lights does there have to be exactly seven people fighting for the light or can there be more? e.g. Mickey, Sora, Riku, Kairi, Aqua, Ven and Lea, be what are technically the seven lights but then Roxas or Donald and Goofy can join in the fight too.
Also even if there have to be exactly seven lights that doesn't seem to prevent Lingering Will from joining in the fight as well seeing as he doesn't have a heart and therefore isn't technically on the side of light or dark. This last part seems especially plausible seeing as he seems to just be wandering around the Keyblade Graveyard looking for a chance to destroy Xehanort.