Getting Marchand would be so much fun, but don't know what would be needed to be given up to grab him. I'd also be disappointed if Cmac focused on Carlo.
Honestly, don't think Mitts is in the cards to be moved out. Use him as 3C, plus insurance incase of injuries you need him to move back up to top 6.
Plus, it allows flexibility in the offseason. He is still signed, so if say he shows up in the playoffs like he did last season, or basically does anything to regain the confidence of Beds and Cmac, it's not as painful to not resign Nelson.
Or if the Avs look to resign Nelson, you can move out Mitts, I'm sure he would still hold some decent value around the league, no matter how much people around here have fallen out of favour with him