Pete Carroll, for example, is not eligible because he only coached USC for 9 years and the college football HoF requires a decade
He had 2 national titles and 7 seasons ranked in the top 5. He won 83.6% of his games. But not eligible.
That said, if he came and took a one year job at SUU and went 0-12? Then he'd be a shoo-in.
He'd still have the 2 national titles and 7 top-5 seasons. His win percentage would drop to 75.8%, still well above the requirement. But he'd have the all-important ten seasons