The consultancy question has come up a few times.
Rangnick and his assistant, Lars Konetka, run a consultancy firm which advices clubs on their growth strategy and structure.
He is putting this business on hold whilst he does the interim manager job at United.
Although the board had said that the interim was to work with the current staff he will be bringing Lars with him. This seems to a concession from the board.
After the 6 months when he is a consultant he will not be exclusive to United but will provide consultancy to United and to the other clubs that he currently has consultancy contracts with; so this is a great way for him to grow that business. He becomes very high profile and has United on his CV as a client for at least 2 years.
Source:
Manchester United Picks Ralf Rangnick as Interim Manager - The New York Times (nytimes.com)