I was going to post something, but considering the Meyer news I figured it would get buried. I heard something about this last night.
It makes a ton of sense. Now if Mullen leaves and you hire a pro style offense head coach, then it doesn't make sense, but Russell just doesn't fit the offense that Mullen wants to run and it is probably best for both to look else where.
Mullen's offense works so damn well with a running QB, why he would change things for Russell makes no sense to me, and why Russell would want to run a Spread Option attack is beyond me. This guy would fit perfect in a Cutcliffe offense.