So, Linnehan was never a problem?
And, really, this “Garrett’s offense” thing is overblown. He hasn’t created something highly unusual or that is notably different than other teams have run, he’s just been a little more vanilla and the play calling has been a bit too predictable. Adding a few shifts and misdirections will make a lot of difference, as will less predictability.
People that say "Garrett's Offense" don't even know what it means.
They could hire Joe Montana as the OC and he could basically make it a West Coast offense using the "Garrett Playbook" by always calling the plays that have horizontal routes.
The Ghost of Al Davis could come in and make it a Raiders Offense by only calling the plays with go-routes.
It is the plays that are practiced the week of the game and then called by the OC that determine to focus of the offense.
Obviously new variations are always added but the OC is what determines the offense, not the playbook.
It's as-if fans think the Walah/Montana West Coast playbook had zero go routes in it or that Zone Blocking teams burn all the pages that have man blocking plays.
Moore can put in any play he wants using the same base playbook. If he wants to install a play where all receivers just run in a circle, he can do that on a Tuesday and call it on Sunday.
Moore can even draw up a play during the time while the Cowboys defense is on the field. He can have Frederick play WR, Zeke play QB and Tavon Austin block as a TE.
The playbook is not like evidence in a trial that has to be submitted to the court ahead of time. As long as the play is within the NFL rules (Frederick would have to report eligible), he can make it up at any time.