Interesting.

Why retain anything on Myers. Seems pointless

You don't have to retain on Myers.

Canucks aren't much better than Sharks so I highly doubt Karlsson waives for Vancouver. Hes not going to move his entire family to Vancouver for another non playoff team.

As good as Karlsson has been I'm not sure it makes sense to take that contract. The Canucks already have a considerable amount of cap tied up in players over 30 (Miller, OEL and Myers) and the Sharks would have to retain a significant amount for it be reasonable. I don't think they make good trade partners unless Karlsson selects Vancouver as one of the only places he'd go.