But I saw Rickson do it...

An interesting idea to warm-up and relax a competitor. However just as after "Rickson Gracie: Choke" (Robert Raphael Goodman) came out and everyone plus their mother was out rolling around on the beach because "Rickson did it!" I can see a lot people doing this at tournaments in the future. Remember a warm-up is what gets you primed and ready to compete and will consist of unique behaviors and drills that gets you in fight mode. Practice what works for you which may not be what works for Kron and Rickson Gracie.