Ryan Grubb

[Really Clark?]

If we are focusing on coaches that know the SEC, then we are screwed. There isn't a single offensive coordinator in the SEC right now that screams potential great head coach. If you look at offensive coordinators nationally, you have:
Ryan Grubb at Washington
Garrett Riley at Clemson
Jeff Lebby at Oklahoma
Will Stein at Oregon
Brian Hartline at Ohio State
Sherrone Moore at Michigan
Zach Kittley at Texas Tech
Collin Klein at Kansas State
Andy Kotelnecki at Kansas
Kendal Briles at TCU
Ben Arbuckle at Washington State
Mike Yurcich at Penn State
Alex Atkins at Florida State
Phil Longo at Wisconsin
Brian Lindgren at Oregon State

I'd look at all of them before I looked at an SEC OC.

G5 offensive minded head coaches:
Tom Herman, FAU
Clay Helton, Georgia Southern
Jamey Chadwell, Liberty
Tyson Helton, Western Kentucky
Jeff Traylor, UTSA

Of these, Helton and Herman would be my top two.

I don't think anyone is strictly saying SEC coordinators but coordinators with SEC experience, especially SEC coordinator experience would be on a more preferred list. Lebby, Longo, Briles. But you are skipping Mike Denbrook, he is a very good OC at LSU. Has done good work with QB's as well.