In situations like this, it's important to work with what you know. You have no control over what you don't know.
What do we know? Well, we know that we cannot win the Cup with 4 forwards taking so much of the cap. Hell, even Edmonton are struggling to do it with McDavid.
So firstly, we have to make sure we don't have that much cap tied into 4 forwards. Moving Nylander is asinine as it doesn't really change anything cap wise, and it still keeps 3 x 11 mil players on the roster that cannot produce enough in the playoffs.
So which of the 3 (Matthews, Marner and Tavares) are you able to still compete if you get pennies on the dollar?
Tavares. Tavares is the answer. He has to be the first to be moved. You have to convince him to waive his NMC. It's happened regularly over the years. In fact, I can't think of many examples where a player just refuses to waive their NMC.
Then the hard work begins. You have to, HAVE to, work out a deal with a team he'll go to. It won't be pretty, we might have to take a step back for a year, but it's the only way to keep Matthews, Marner and Nylander. Then, you could get full value for Marner once you're not absolutely cap f***ed.