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Final Approach
I have no idea what happened in Ron's case, but you're at best partly correct about Bruce. At least, circumstantial evidence points to innuendo about having a financial conflict of interest as regards 3rd class medical reform as being the trigger for his deciding to say adieu to PoA.Except that no one here 'chased' Ron or Bruce away. They both apparently left because they could not have things their way.
I hasten to add, that this was not a widely held POV but just something insistently stated by one poster. Someone else who tried the same angle on the Red Board apparently got banned for a month for it.