Believe it or not points aren't all that plays into salary for defensemen.
Carlo is a decent puck moving defenseman, he's nothing more than an average to below average in terms of defense, Ericsson plays a ton more in shorthanded situations, and is much more physical. Different players demand different salaries depending on the role they play. One also had much more leverage on the team, Ericsson's not a world beater by any means, but he does provide something the wings don't have much of on the back end, toughness, and size. Which the Wing's lost quite a bit with Stuart.
Fair points, but I gotta disagree with you on Ericsson being more physical. While the guy does have the size advantage, he's also a pylon and rarely makes use of it. He is a decent puckmover though.
Haven't watched too much of Carlo so can't really comment on his defensive abilities but yeah, the general consensus seems to be he's a solid 5th/6thdefender when he's healthy. Also, he's got pretty good numbers.