Well Barnes just needs to opt-in, right? Who would opt-out of a 25 mil guaranteed contract? That'll make him the 35th best-paid NBA player next year, and 15th best-paid forward. (Side banter: Is he the 15th best forward in the league?) But either way, I don't think anyone is paying him that out there.
CB seems willing to help nurture the kids. Have championship knowledge. Plus we surely need more help on the wing defense category. Even just on the court, CB can be a nice enough backup to Barnes.