Sam Darnold is playing for Kevin O'Connell and still hasn't overcome those issues either. The strategy of Kevin O'Connell is schemed in a way that the QB doesn't have to. Its why Kirk Cousins looked great there and no longer does the moment he left. Rattler would look 10x better if he were there as well.
Mayfield I'm not sure of. You may be right there. I don't watch the Bucs much at all. But I do notice in the few games I watch, Mayfield pulls down the ball and starts running the moment he doesn't like the defensive look post-snap. Im not sure what triggers that. But it could just be his answer. Which would still make you correct.