Is it better for the Rams if AD walks away or if we can trade him??

Many of you are a LOT smarter than me when it comes to contracts n such. I'm wondering....If he walks, is that a cap savings that can be used for FAs?? Does he still get some of it?? IF traded, would it have to be for an extensive contract for a team to give up much in value?? I'm totally unsure about it all.