Personally, I think Wiz being bought out was almost exclusively expansion draft related. Canes need to expose 1 defenseman to the expansion draft who is under contract for the following season and played a certain number of games:
Wiz: Nope, not signed past this year
Hainsey: Nope, not signed past this year
Tennyson: Nope, not signed past this year
Slavin: Exempt
Pesce: Exempt
Hanifin: Exempt
Faulk: Yep
They aren't going to expose Faulk, so buying out Wiz, who was only being paid $3M this year means Ryan Murphy will get the nod and will likely be the one exposed. If they were to trade someone like Fleury for Myers, it would likely mean Murphy is out of a job and we're back to square 1. Yeah, there are other ways to solve that problem, but it mean making other moves or overpaying someone on an extension.