The idea of Helfrich makes sense on a "ego" level for Frost. You KNOW he wants to be involved with playcalling, even if he is publicly saying he needs to get better at just overseeing the Team. Helfrich is one guy where Frost would have a harder time meddling with, simply because of their previous coaching relationship.
And imo, the Duck offense does not bother me. It can work, it just needs someone who can call it with current and future purpose in a game.