If these guys are now being referred to as 'gurus', I would say it's because they have proven themselves in tournament circuits around the country. I believe Starlo held the record for the biggest BREAM money winner for a while (and that's a LOT of $$), Bushy held the record for the heaviest bag, and Ian Miller has a record of consistently placing in the top 10, as far as I am aware. Their records would all be on the ABT BREAM site anyway.
It's one thing to catch heaps in your local area but it's another thing to consistently perform well all around the country... and success like that brings media exposure, of course! Can't vouch for their head size but it could well be normal enough.