PilotDAR - see my #27, same issue. Unfortunately the Powers don't seem to realise that one doesn't lose ones brain when one loses ones medical category - unless for insanity !
Very experienced airline instructor lost his medical, but argued that he hadn't lost his brain, and could instruct qualified pilots - who would undoubtedly be PiC - in the finer arts of instrument flying towards their I/R flt. test. No way, bureacracy has no sense of humour.