I think you might be right about the latter :(

About the former though - it is a very new theory that requires a lot of specialist knowledge to advance, so it is not surprising at all that there aren't that many people working on it. I'm not saying that nobody in top 100 works on it, only that those 2 philosophers are the ultimate driving force. There are some more, but a lot of them aren't from philosophy departments, are from other countries, and majority are dealing with small issues within the theory. Also, my msc supervisor works on something very similar. But it's different when you write a thesis on something without a lot of available literature and a supervisor who is only interested in your topic, OR write under the supervision of a person who is the driving force behind that theory. I am only thinking about this risky step because (1) theory seems to have a potential, and a potential to become something grand within some 20-30 years (if it works out of course) (2) the philosophers are well respected, I wouldn't really go for the average staff member or an obscure 'genius'