The idea that he doesn’t work well with characters he didn’t create doesn’t make sense considering one of the best shows on television, one he had zero hand in creating or developing, kept having him come back to direct increasingly more and more important episodes.
The idea that he doesn’t work well with people or their creations doesn’t hold a lot of water when looking at his career, a career which has never actually had a failure in it, looking at both audience, critical, and financial receptions.
I think maybe you’re misinterpreting or responding to someone other than me because my point was not to slander Rian as hard to work with, or to minimize the role of a director. But it is clear he did write TLJ and did not write Breaking Bad which was deep into its own arcs which were followed completely under his direction. The difference between those two examples is the amount of control and authorship.