It's not hard for scramblers to own a defense with the lack of talent that ours has had. The type of stuff that works against second rate defenses is the type of stuff that's easily taken away by worthwhile defenses in this league, and the fact that Allen relies so much on those type of things rather than playing the fundamentals of the position is why I don't think he has that high of a ceiling.
Darnold has a high ceiling, low floor. Nothing he does would surprise me. He's your usual Jet QB except more talented.