You'd have to hope against hope that he's told the club that this sort of archaic structure can't continue. For the faults he's been responsible for as manager, he seems to know exactly what the issues facing the club are.
While it's nice to have Rangnick helping behind the scene, we started the transition before he arrived with the appointment of Murtough. The problem was that from what I understand until Ole left we were still in an hybrid mode, with the manager having more power influence on the first team, hopefully we will never see that kind of setup ever again.
As Rangnick said, with that kind of setup it almost doesn't matter how good the manager is, it's too much responsibilities for one person. The thing that the likes of Wenger and SAF were great at was delegating to the right people and evaluating the work of these people. People like Mourinho and LVG never did that in their career while Ole wasn't a good enough coach for Manchester United. And I don't blame them, it was the responsibility of the CEO to understand that specialization and teamwork were a lot better for everyone involved.