I actually like the idea of moving Tanev and signing Gardiner if the term and AAV is reasonable.
Edler-Myers
Hughes-Benn
Gardiner-Stecher
Biega, Fantenberg
Each of those pairings could be rolled at 5 on 5, and Gardiner, Hughes, Myers on the PP allow Edler to be given less of a role there which i believe is important to improve the PP. Gardiner and Hughes would give the Canucks a potent PP duo imo and Myers also has some tools that would help. Edler and Benn as mainstays on the PK instead.
Tanev is great defensively but I think this moves the team more in the direction Green wants them to play.
EDIT: Gardiner is WAY better than he is given credit for by Leafs fans and homer media. They needed a scapegoat to deflect from their star forwards and overall defensive effort $&!#ting the bed and Gardiner has been it.