The Georgia fans are in a bit of a logical fallacy right now. They keep saying Saban went 7-6 his first year and then turned Alabama into its current powerhouse form. Problem is, Saban was a known element as a great head coach before that, and his success at Michigan State and LSU reflect that.
I'm not a big fan typically of coordinators moving straight into head coaching positions. I've seen too many great disciples turn into disasters. I think Saban's coaching tree is about 50/50 when moving out from underneath him, but I would project the ones that found more success moved into transition roles as HC at smaller schools/the Fisher situation at FSU before becoming head coaches in legit P5 conferences.