So, if he moves on for any reason, Saints have $40M new on the dead cap. They're already at $41M I think so Carr would double the 2025 shirtpile. (With impacts from Ram and possibly Taysom on the way also).
If they traded Carr for a 5th, they are basically mortgaging $40M of cap space in dead cap for a 5th round pick. Oy.
I'd rather them keep him and add some to the dead cap only by restructuring him, to free up some cap space in 2025, because they are already in dead cap jail. In 2025, Carr might start, be the backup, or help out in laundry service.
As for Carr to the Giants, sounds like Ross was giving an Instructive hypothetical regarding whether a new coach wants Carr out of the building. I just think that because Daboll got lucky and was retained, I find it hard to believe he would turn to Derek Carr. A slight chance as a bridge if they draft a QB high.
No real cost-benefit to the Saints though other than to the team and fan psyche.