Ghirahim seems like the main villian of skyward sword as of now,and maybe we will fight/Encounter him alot during the course of the game,But for some reason I just don't think he will be the main Villian of the game.Mostly because Every Game since Twilight princess has had a different main villian than you originally thought.For that reason the events happening in skyward sword will probally lead up to Ghirahim ressurecting the imprisoned completly causeing him to turn to his complete form which is that picture that w've all been speculating about.Its just so obvious that the imprisoned will be the main villian,I mean what would they gain from setting up a game with a crazy,physco ancient evil and put him in the shadows and eventually be forgot about,Nothing that would be stupid.Maybe I'm wrong and I wouldn't mind Ghirahim to be the main villian and if he is than he might be a awsome one,but it would make more sense for link to banish A ancient evil monstor than to have to always battle his puppet.