There are things that work against certain defenses, but not others.
There are things that work with certain personnel, but not with backups who seldom see the field.
There are things that work in some stadiums that are quiet or filled with Cowboys fans that don’t work in loud stadiums.
Maybe there was less motion and shifting because we were playing with new receivers and one up from the practice squad, along with missing our best offensive linemen. Maybe the offense is simplified to avoid penalties when playing with inexperienced backups. Maybe it’s easier for backups to figure out blocking assignments when audibles aren’t happening at the last second and players around them aren’t moving and shifting. Maybe we kept things more basic on the road in a loud stadium vs a team that blitzes or disguises more than others. Maybe we forced the run from basic sets more on our side of the 50 to avoid the chance of young, inexperienced receivers not seeing what Dak sees, resulting in turnovers when we already know we can’t get in a TD race with so many scrubs playing and our QB getting killed on lots of drop backs. Maybe we ran into some defensive coordinator’s that challenged Moore and made him have some growing pains.
I think any of these reasons, and probably several others, are much more likely than Garrett stepping in to take over and sabotage an offense that had been winning and making him look good. That argument has no logic to it at all. Every coach, head, coordinator, and assistant, benefits from each other’s success and the team doing great things.