That's what Ghirahim looks like without his cape on. I like him better with his cape on. When he doesn't have it on he looks...... Kind of........ Bare.
We already know this, he's refering to the shiny black cracks and lines all over his arms, chest, legs, and face.
I don't really like the theory that Ghirahim turns into the dark Master Sword. ...for me if Ghirahim would turn into the "Anti-Master Sword" it would just feel like it did feel for me when Zant was just a whiney guy with no powers at all untill Ganon comes and gives him powers.
To me it does not look like he is gaining power. It looks like he is being taken over or something. If you have ever seen iron man 2 where Tony stark is being poisoned from the palladium reactor in his chest, Ghirahim's condition looks like that.Of course, unless it's a one-two fight with Ghirahim and then his master and this is Ghirahim getting some sort of power. Maybe that rumor about Ghirahim only reviving his master for selfish purposes was true.
To me it does not look like he is gaining power. It looks like he is being taken over or something. If you have ever seen iron man 2 where Tony stark is being poisoned from the palladium reactor in his chest, Ghirahim's condition looks like that.
He also seems to be enjoying it. If I were being taken over, I wouldn't be too happy about it. Just look at Cole in Spirit Tracks when Malladus took over him.