What in particular makes him suited to be the Joker? It seemed he's just acting out his skit with mediocrity. You know who else could do that? Almost every other actor on the planet.
Not saying the dude can't be him but you're not making a convincing argument for why when all he's doing is acting (which every actor does). It's like saying, "Oh my god! This dude should be play Abe Lincoln because look at him acting!"