I think you are missing some context to both that situation and also what knowledge that experience has given him.
Firstly, he made the finals 5 out of 6 season during one period of his Parramatta tenure. Obviously a slow start and some rocky times, but he took over a team that had been sliding badly down the ladder for years and eventually got the Wooden spoon the year before he took over. That sort of experience is relative to us, and I cant think of anyone who has gone through a similar situation and been able to learn so much from doing so. He worked through the blueprint, knows what worked, what didnt. I cant think of any coach out there who could provide that sort of resume that is required to pull this dump out of the doldrums. He is the only available coach who has previously achieved what we are desperately seeking