Maybe the folks at CBS didn't think Fuller was "the best people."
If that was the case then I wouldn't think they would have gone after him in the first place. I do understand them wanting to take a wait and see aproach and see if "Discovery" is a hit before going all in on the "American Horry Story" idea but I don't see why the felt they needed to rush the show. Their would always be a audience for it, whenever it came out.
Jason