With Sather staying on as an advisor, I think that they only person they would bring in is someone who would share Gorton's vision and plan.
Which is why, on multiple levels, I think that Gorton winds up wearing both hats and eventually passes the GM one to Drury. Gorton has seems to have carte blanche to carry out his vision to a tee. And he has been operating as such. For someone, even a JD, to come in and be told that we have picked a path and it must be allowed to be executed......well, let's just say not sure how many would sign on for that.
Gorton has been operating with clear eyes and a straight heart. He is not taking into considerations how fans feel about things and his vision has been signed off on at all levels of management. With all that, who better than to continue to execute it on a franchise level?