Everyone here talks about wanting Stoops or Richt being in that top tier of coaches. Both, were only coordinators (Richt was FSU OC and Stoops was UF DC)before they got their current positions. Of course, success at a top program as a coordinator that doesn't mean success - see Muschamp as an example.
Good coaches are good coaches.
Think about Malzahn or Briles. Malzahn was a head coach in high school as late as 2005 - in less than 7 years he is coaching at Auburn.
Briles was a high school head coach in Texas as late as 1999.
A program finds the right guy, pedigree, where he coached before, etc. don't matter.