A lot of comparisons with Marner here, so I will stick with that.
Nylander will be overpaid next season, there is no getting around that. However, I am really impressed with Nylander's turnover numbers. He has had 50% more takeaways than giveaways this season. That shows great poise and awareness, and I think it adds to his defensive value too.
Marner on the other hand had more giveaways than takeaways. He shows no poise and just gives the puck away every time someone comes to hit him- he does this a lot.