I mean, "Democrat in Disguise" is unlikely, but "Fake Republican" is pretty accurate. Mostly because he has such a childish, passing understanding of politics that before this whole thing started I doubt he would have been able to tell you the core philosophies or keystone policy positions of either political party.
I wouldn't be surprised if he originally hewed a little left of center on everything but taxes, labor laws, and race relations, to be honest. Though at this point he's been pretty thoroughly briefed on the party policy and probably has internalized it to some extent.
Oh I don't believe he's a Republican, I just don't believe he's some kind of saboteur working for the Dems.
Watch his conferences. Not the teleprompter ones, but the ones where he just lets go. This dude means what he says, it is written on his face. His emotions are genuine. It's anger. It's frustration. It's the belief he is the victim. He is passionate about it. How quickly people forget that he led the birth movement against Obama.
This is a man that means what he says. He's not putting on a show.