Wilf McGuinness worked along side Sir Matt, well virtually, and that didn't work and neither will bringing in anyone else to work along side Sir Alex.
Whoever you want as his replacement be it either Jose or Pep or David Moyes would they, managers of experience, be willing to work along side him and what would be the point if after Sir Alex steps down they change everything that they didn't agree with to the way they want things to run. Might as well give them the reigns to begin with instead of creating a possible double start.
Whoever comes in must be allowed to do things their way because it just aint going to work any other way, like it or not.
Yes Sir Matt was there when Sir Alex took over but SA was the boss no mistake and the next manager has to be the boss.
I just hope it is not for years yet and don't worry about the two at the emtyhad only one will get the job and if Ronaldo moves there is only one club that he will join.