that looked like just regular boxing to me. Boxing = one part of MMA striking. And of course they'd take them down. Why would they want trade punches when they could just own them on the mat? Submitted or GNP in under a round by any of the guys you listed. Ofcourse Hughes/Penn/GSP have 30 pounds on them. Maybe Gomi or Sherk would be closer in weight. Anyway here is lightweight who encompasses all that is striking. Punches/Elbows/Knees/Kicks/Fighting from the clinch.
http://www.youtube.com/watch?v=M3R4xtjl5b4

On a side note great fight. Did it win fight of the year honors?