He came in and while he was obviously a business expert(some may even say genius) it was clear from day 1 he clearly knew nothing about running the football side of the business.
The has been shown to be clear from that car crash of a first transfer window, to his managerial appointments, to the insane contracts he has been involved in.
He clearly needed help running that side of things, and whether its true or not the way it appears from the outside is that he didn't get it because he was too proud to admit he needed help or didn't want to give up power.