Yah buts..
Been reading through this post and seems to me you have been getting some really good advice. Roger had a great question about what would be an ideal outcome...and maybe that is a question to ask.
Sounds as though the person sent to shadow you resented you being presented as a "role model" (sort of a "look at how X does it").
And I was listening to one of David's interviews (think it was one of the upclose series) in which he mentioned how people have a comfort zone around a certain level of stress and when GTD helps to eliminate that...it feels unfamiliar...so they go back to their stress levels ...because it's familiar! Maybe for some people being stress free feels boring. Thomas Leonard once said that "boredom is the gateway to peace"..
Would love to hear how the situation resolves itself...but I suspect that if you keep showing grace under pressure (as it seems you are doing) you will have people coming to you (maybe at night time when no one will know...
and asking you how you do it..
Anne