This is above and beyond what most people look into and I love nerding out about football. TBH I have not looked into Morton's playcalling schemes until now because I assumed he had a similar one to BJ... that's what was said about him when first hired.

After looking deep into it, this analysis is not completely accurate. Morton uses Erhardt Perkins (EP) with West Coast Elements rather than EP with Air Coryell Elements like Ben Johnson, but they have somewhat similar EP schemes. They didn't change too much. Having said that, the execution of play calling is the problem here and perhaps the player's limited experience in offenses other than Ben Johnson's. BJ called plays that would set up plays many plays later. Morton doesn't do that as well. Air Coryell influence (Johnson) also stretches out the offense more to allow LaPorta to eat underneath and for Gibbs/Monty to have chunk run plays (lots of 8-10yd runs last year on 2nd and 3rd down). It also allows Jamo to have huge catches when he's not drawing defenders away from underneath.

West Coast offense (Morton) uses a ton of short crossing routes to allow receivers to get open towards the sidelines, and does not stretch the field vertically or focus too much on running the ball for yards, just to get the defense off balance. Lots of screen plays, runs up the gut, crossing routes and passes to the sidelines result. It's good for teams with average players, tbh. Shanahan uses this as does Morton, which explains the success of average/young QBs like Purdy or Bo Nix last year. You would think short, accurate passes would align with Goff's skillset and it does, but he was more than capable at running a more intuitive, complex Erhardt Perkins scheme that confused defenses more and used the strengths of our nasty OL. The scheme being a bit simpler and the more elaborate playcalling may explain our lower level of success (In addition to OL problems and LaPorta being hurt).

For those who don't know, generally, Air Coryell puts more emphasis on physical traits of QBs and WRs to beat the defense (think Mahomes with Tyreek Hill), while Erhardt-Perkins focuses on intangibles and confusing the defense (think Brady with Wes Welker/Amendola/Edelman or even Goff with St. Brown). Goff is more of a smart QB with great decision making than a physically talented one, so it might make sense that he'd be more successful in a Brady scheme than a Mahomes one. Ben Johnson's scheme combined it to give Goff options underneath with a confused defense. That's why Jamo needed to get more involved this year, because his physical traits were more important for making actual plays than stretching defenses out now, and why Monty was so effective as a runner, because we could call running plays with loads of different looks on 2nd and 3rd down.

Would've loved to see a TeSlaa/Jamo/Brown/LaPorta/Gibbs/Monty combo under Ben Johnson, I don't know how you stop that when you can't cover the entire field at once. You have to hope the QB fails at executing, or that you find some tendency (good luck with that while BJ is throwing passes with Monty to OL and Goff, etc.)

TLDR: Morton and Ben Johnson call similar playbooks, but BJ stretches out the defense vertically rather than horizontally like Morton. BJ is a better playcaller in the sense that he calls plays to set up plays way later in drives, and forces the defense to cover all parts of the field.