John Harbaugh effectively transitioned the Ravens from a declining Superbowl winning team under Flacco, to an upstart challenger in the AFC with the anti Joe Flacco in Lamar Jackson. The QBs could not be more different, and the styles of offense were adapted to fit the skill set of the QB running the position. Nagy has a vision, perhaps an amazing one, but this team and this QB does not meet that vision.
I rank the offensive issues in order as Nagy and his stubbornness to adapt his scheme, the offensive tackles, and then the QB. It can be said that a great QB can hide a lot of flaws and we look no further than our own division to see that on the regular with Rodgers. But Trubisky isn't Rodgers, and unless the Packers want to swap with us at the end of the season, Rodgers isn't coming. Nagy needs to adapt or be replaced.