You're not getting Buckner and Payne. If the trade happened before March 15, you just wouldn't go after Payne, if he's even allowed to leave Washington. If the trade happened after March 15, and you already signed Payne, you wouldn't go after Buckner in the trade. It's the same logic fans are using for why Payne will even be a FA....because the Commanders wouldn't want to spend 40Mil on the DT position alone. Payne and Buckner would be the Bears spending 40Mil on DT. Of course, they have the money to spend 40M on DT right now, but they won't in a couple years when you hopefully have to sign Fields to a huge contract.
Also, probably not getting Will Anderson if you trade down to 4.