Interesting. The GR guys were successful. But then so was Schultz for one match, and Cejudo was quite accomplished as was Rosholt, Cormier, Woodley, Lesnar, and Askren (in MMA not UFC). MMA, you have to get to the legs to take down. I don't see where GR technique in TD is used at all. There could be some throws but usually legs are involved, but not near as often as striking or full on takedown.
Just my two cents.
mspart