He has screwed his job as being the Raiders HC, he screwed his HC job this year, he won't get a third shot elsewhere as being a HC for sure.
He proofed being a good choice as a DC.
He would be crazy to stay on the path looking for a HC job when he was fired here.
Crazy speculation. Maybe everything is a done deal, and everyone was aligned before - SP gets his sabbatical - DA becomes the interim solution - this is also why we haven't announced a new DC, but only two CO-DCs - and this is why ML hasn't fired DA already - everything to provide SP a smooth return.
I have seen many examples - ok, not inside the NFL - but during my career, where promotions would be cancelled and the promoted person steps back in the old job role, because he/her was to good in his old - but a clear peter princible candidate in the new.