To be fair, I can't really think of one KB'er that wasn't a very good athlete. I'd say Bonjasky had to be up there.
He certainly had the edge in athleticism on this night. :yep http://www.youtube.com/watch?v=jCd1eL3uIYk
Andy Hug was also an athletic fighter. He had a remarkable carreer in Kyokushin-Karate before he fought as kickboxer.
Cro Cop, and Hug as someone else said... I've never seen anyone at else throw kicks with the kind of fluidity these do at HW, especially Hug. I've never seen anyone throw kicks like Hug did PERIOD.