I heard rumors elbow on a thigh doesn’t work above purple belts. That it is annoying, not efficient technique. Well they are wrong 🙂 I use it since I was white belt both in academy and competition. Well executed works on everyone from white to black belt (haven’t tested on red ones, so can’t tell 🙂 ). Just remember to keep your balance and constant pressure. Grinding is not working.
Check out more BJJ stuff on my blog: http://pawelkaczynski.com/