Excellent work. What you see from 2015-2017 is the result of getting rid of Galette and Graham, both one year after signing them to extensions, and then later Byrd, and then 2021-2022 was the team having to jiggle Brees retiring with the cap going down because of the COVID year.
But from 2023 forward, where the cap should have been getting in better shape, you see the dead money trending back up, with no justifiable reason or any postseason appearances to show for it.