I just looked at Carter's stats for this past season and he's still a 21-5-5 guy...So he's still a solid contributor and he's always been a decent defender. He was never great on defense, but he'll be AT LEAST as good as Hedo is/was.
I think the Nets are targeting James with this move. They're stock piling good young talent so they'll be under the cap when James becomes a FA AND they'll have a good team that fits in with James playing tyle. Harris, Lopez, and now Lee. That's a lot of potential right there.
I don't think he'll move to Brooklyn, but atleast they're trying, lol.