It's just rare for a guy's first HC gig to be at a major program.
Stoops at OU
Weis at Notre Dame
Malzahn at Auburn
Helfricht at Oregon
Kelly at Oregon
Osborne at Nebraska
Solich at Nebraska
Petersen at Boise
Switzer at OU
Coker at Miami
Muschamp at Florida
Pelini at Nebraska
Shaw at Stanford
Richt at Georgia
O'Brien at Penn State
Bielema at Wisconsin
Swinney at Clemson
Fisher at Florida State
These are just the ones off the top of my head
Also, I've been saying for three years now, the risk of missing out on Scott because we didn't think he was ready yet, is greater than the risk of hiring him with a lack of head coaching experience and having it be bad.