@Moon But then again, you also have to look at all the contributions that were never made because that "10x" person was there.

Bus factor is key. For a project's longevity, broad contributions are more important than a single rockstar's achievements, even more important than short-term code quality (which the rockstar may or may not care about, depending on the type of rockstar).

This is the insight behind Pieter Hintjen's concept of "optimistic merging" and the C4.