What's the value of CMC?
Swap Barkley for CMC or would you give up a 2027 1st for CMC?
All depends on the state of your roster. I've owned Cmc since his rookie year and am looking for my 4th chip in the last 7 seasons, so a 2027 1st is not worth it for my roster, nor would the lateral step of swapping for Barkely.
If my team is middling or rebuilding, then I think the 1st is a decent enough cashout given how quickly the value of these RBs depreciates. Still don't think I would move him for Barkley in this case as you are still sitting on another depreciating asset, except one now coming off a disappointing season, 1 year removed from a high mileage career year.