I'm a reasonably good developer (been selling software in one form or another for nearly 2 decades) and I've worked with people who where twice as productive as me bit I've also worked with people who where 1/5 as productive.

So relative to them the x2 developer looks x10 where compared to me he looks x2.

It's all relative, in a company of top-class engineering talent their should be no x10 engineers as if there are then the others by definition aren't top class (though possibly still way above average).

As for been a rockstar who wants to be they die at 27 in a drug fuelled binge or live long enough to become a mockery of themselves.