Here comes another argument...
Well, I believe that it is impossible for the moon to crush the city, killing link BTW, and only turn it into Twilight. That just makes no sense. In the game, it shows the moon killing link, I know because I have ran out of time before. it would make perfect sense. twilight is the light before the sun rises. if the sun rises, that means the moon is setting. if the moon never sets all the way (because it crashes) the sun never rises all the way, hence peremanent twilight, hence the twilight realm. and as the post above me states, when the twilight beasts are turned back to normal they are normal humans or whatever which is what i was trying to say before. they are obviously not gerudo, so who are they? (rhetorical question. dont answer)
And just because the masks look the same doesn't mean they have a "connection". Nintendo usually uses simaler designs for Zelda games.
But you never know, I am just saying I don't believe your theroy.