Well, the biggest question, regardless of who he hires, is will Malzahn turn the reigns over to him and let him do his thing?
In addition, Lashlee was a Gus protégé. The offense that CGM designed is what was going to be run (Sans the whirly-bird). If he hires Briles or Kelly or whoever, do we see a different offense or does he demand they learn his scheme and run it his way?