They are now, ALL "JKD" practitioners.
So far as people coming out of "standard" JKD curriculums, Erik Paulson did quite well back in the day. I believe Matt Hume was a JKD guy if I'm not mistaken. There were also a few others whose names I cannot recall who didn't fare that well. And that's mainly because it's not the "style" that matters but how prepared the individual fighter is that is most important.