They let Barkley go and paid Jones. There's no chance both the GM and the HC were against those moves.
Simply put, Daboll got them to the playoffs with Jones---and since he fancies himself a developer of QBs, he felt he could create a functional Josh Allen out of him. Turns out, Daboll is not that. He's just a guy who has benefited from being around some of the best ever (BB, Saban, Josh Allen). On his own, he's a bust. He's Nate Hackett.