Martin is under contract for 2019-2020. You're going to burn assets to move him? Who is taking that off your hands? Even without Zaitsyev, you've got four dmen and four forwards to to add for ~13M (and that's assuming Marner, Nylander, Kapanen, and Matthews are only $20M)
Good luck.
Like I said, Edmonton has had a "simple" issue to fix, too. Here we are years later. Still against the cap and forward heavy, light on D.
Leafs fans have seen this coming for years! Trade board is full of "Nylander for equivalent D" proposals. Trade for other team's elite D. How many OEL to Tor threads? But still, here they are. On the verge of caphell years later, trying to figure out how to balance the roster and keep the shiny pieces before D-day next season when they have zero cap space and Rielly is their best dman.
The point of a Nylander sheet will be to force their hand and their margins. It isn't just to add Nylander or not in a vacuum. Same with Matthews. How do they match when they can only go over the cap by 10% during the off-season? What panic move do they make to accomodate? Or do they look for best value out of their disgruntled #2 C, Auston Matthews?