It's probably the opposite. If Nylander is traded they'll get flowing hair, sublime zone entries, 70 points, double flamingo shot blocking, some skill on the PP, and the odd takeaway. After 4 years of this a fan of said NHL team will say: "I wish we never gave up the assets for him. He sort of leaves you wanting more." He does not hit, take faceoffs, kill penalties, throw checks in all three zones, puck retrieve, etc.
I'm not exactly sure what Nylander gets TOR in a trade. He's always been a leaf. He had a career year last season and he doesn't cost much. A return for him could be bigger than you think.