The fact that there isn't a single leglock among them.
My sentiments toward leg locks are no secret. And your mileage may vary - especially when it comes to no gi competition. But peer beyond Kron's immaculate quartet and, to steal a line, it's heel hooks all the way down.
As much as I respect the performances of Galvao, Cobrinha, Romulo and old warriors like Sperry and Gurgel whose age approximates my own, Cyborg's upset victory over Buchecha in the Absolute ... it is easy to find inspiration in Kron Gracie's performances in China this weekend. His jiu-jitsu is a kind of solution.
" ...of course the techniques are great – but the sensibility of the opponent, the sense of touch, the weight, the momentum, the transition from one move to another ..."