@grover he's not top 5. I sure hope to put him there some day, but not yet.
I won't rank (outside Saban) coaches but rather group them. Tell me where I'm wrong:
The undisputed best coach in CFB
1. Saban
Consistently puts teams in CFB playoff within last 3-5 years
Dabo
Kirby
Lincoln Riley
Ryan Day
Sustained, demonstrated success over many years; flirting with CFB playoffs on a regular basis
Jimbo
Harbaugh
Brian Kelly
Fickell
Proven, competent head coaches but unlikely to regularly compete for playoffs due to school/locale
Whittingham
Mike Gundy
That's 11 coaches right there. I got Mario in the next tier.
Solid, competent head coaches but some questions (character, lack of proven, sustained history, etc.)
Cristobal
Lane
Freeze
Aranda
Mark Stoops?
I think it's safe to say Mario is likely a top 15-20 guy with room to jump. I'm not sure where you'd put guys like Paul Chryst, Jamey Chadwell, Bill Clark, James Franklin(?) in comparison to Mario.