I suspect the same can be said for most of the instructors who've left GUE ...
... Bob (Grateful Diver)
Since we are going with wild guesses, that probably isn't true. I don't follow the instructor base, but I do know many of the "original" GUE instructors that left just quit teaching. Teaching diving has an incredibly high burn out rate. Once you make it to the GUE level you are probably close to that limit unless you are one of the rare individuals that continues to teach diving for a long period of time. Being in the diving industry tends to be pretty unprofitable and teaching as a hobby is both unprofitable and takes away from diving for fun and other pursuits.