DA was asked to manage Payton's coaching staff when he took the job because Loomis and Co. are loyal employers and did not want to discard coaches who were also blindsided by Payton's "retirement".
DA like any new coaching hire deserves to bring in his own guys and with last offseasons Defensive coaching hires and this off-seasons Offensive coaching hires, DA is fielding a team based off his image and vision and not having to manage the previous regimes vision.