It shouldn't be a surprise after the Gracie Challenge showed most of the arts couldn't deliver against well-trained, well-rounded fighters that systematically exploit their weaknesses. My favorite example on someone from a kung fu background is the video below since it shows how helpless they are without ground training. Also, Rorion's excellent narration.
Edit to add: "At this point, Royce could apply the choke but he elected not to. There's many variables in groundfighting..." Nah, Royce is just an asshole who was putting another asshole in his place with humiliation. He had a God Complex when I met him that didn't fit his fight record. ;)
https://www.youtube.com/watch?v=VN6PvPCrStI
Edit to add: "At this point, Royce could apply the choke but he elected not to. There's many variables in groundfighting..." Nah, Royce is just an asshole who was putting another asshole in his place with humiliation. He had a God Complex when I met him that didn't fit his fight record. ;)