Lashlee went to multiple places and did well... Garrett hasn't yet..those guys would be better off going to a school for 2 years to get out from under their "mentor's" shadow to prove they can do it on their own.
I'd always be weary if hiring an OC who's only experience as a coordinator is under a strong offensive head coach.
Golesh has been an OC for 2 years and a co-oc for 1 year. All under Heupel.