I find proposed trade like this so laughable. You never mentioned the salary that CBJ would pay Nylander. If it's an overpayment why would CBJ do it? Setting a precedent for their team whom soon will have Dubois and Weresnki. If it's a reasonable contract, why wouldn't Nylander sign that contract for the Leafs.
So you now have set a precedent for the Leafs also. Allowing players to be traded to another team in their RFA years, just so they can get a few more dollars.
Totally unpractical for CBJ and Leafs for those reasons, though the trade value might be fair.