Well if the rumour is true, then by taking away the instructor route would not be a particular bright thing to do. I do not think they would do that. But then again if there was something behind the departing of mr D, then the other F.I instructors or examiners would be a little cautious, like mr G, mr B or mr S, just to name a few.
And sometimes they do not like to come and do their business on another mans area, unless it is for a rather a lot of money. But most have integrity because they know later on they would be the ones who may require help.
Fluffy