He's just too arrogant. He really thought this was gonna be easy. He probably still thinks that. Teddy and Darnold failed because of Joe Brady and their own shortcomings. Rhule just hasn't found the right people to properly execute his flawless vision.
He's an idiot.
Rhule has got himself into no mans land. Huge oline issues and no QB to build around. He went all in on Sam (stupid) and screwed the pooch picking Horn over Slater. No way he turns this around in the off-season with what we have to work with.