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3. I imagine JV came up with the idea. They've made such a song and dance about their 'correct grounding' over the years that any change now would be unthinkable.
Given how many others of JV's preferences they've seemed happy to toss out the window, I don't see why that particular one would be any different - if there was sales to be made.....
JV's idea was that all Naim systems should be star earthed, with every component earthed via a common earth point, through the power amp (presumably because the power amp is generally the greatest current hog, with the largest current to dump, should anything go wrong).
Given the regularity with which questions come up about hard to diagnose earth loops, I'd say it doesn't sound that unreasonable!