The question really is not "should they be in?" They would be absolutely. Urban has enough butt lickers around the country the committee would feel pressure.... as they do already, I'm sure.
I don't really agree with the whole injury thing. If FSU gets by Georgia Tech but on some fluke play Jameis tears his ACL at the end of the game they could leave them out? I just don't see how you could look the public in the eye and say "hey, your good enough but your QB is hurt so all of you guys can pack it up - season is over" that is bullshit IMO.
I am not sure. I think we could make an argument for any of those three to be the last team in. I do think the committee will choose Ohio State based on the conference championship regardless. B12 needs to get with program and get a championship game of some kind.