Good question. I dont really know. Collecting stats has become an industry these days. Many of them are flaky at best. DE is certainly one of those .I'm sure there is some sort of metric they use. Other stupid stats include 'time in forward 50' and 'metres gained' which are more easily quantified but equally useless in measuring effectiveness.Genuine question :
How is disposal efficiency judged?
A guy has the ball. He handballs to a guy standing still, with his opponent crowding him.
The handball hits its intended target, but the recipient loses possession because he's motionless and / or his opponent is able to spoil it.
Is it an efficient disposal because it hit its target, or is it a poor disposal because the choice of target was clearly wrong?
Getting to the 12man stage of having a player comfort thermometer in the jockstrap soon...