Saints Cap Moves: Derek Carr restructured, Erik McCoy restructured; J. Williams released; cap space is at -$8,543,537

Eh? If they wanted to remove the no trade clause, Carr would have to agree to it. How does that make sense?

Also, you can’t change the length of a contract after it’s been signed and removing guaranteed income is literally a paycut.

You’ve, inadvertently, just said they were trying to agree to a pay cut, because everything else you listed is either impossible or illogical.
Again not true , They could have been talking about adding void yrs and that would need player approval, just like we did with McCoy. There are a few things that could have been talking to Carr about other than a pay cut .