I don't think there's any reason to believe IC's who follow the "cracked engineer" manifesto would be in the top percentile. It's basically a guideline to make people more manageable and has little to do with engineering talent.
"Crack": adj., first-rate; excellent: a crack shot. https://www.dictionary.com/browse/crack
"Cracked": no such meaning https://www.dictionary.com/browse/cracked
(edit) see the urban dictionary definition in the sibling comment.