Think nylander may be a better core player but drouin perhaps is a better complimentary player. For his contract i would consider trading nylander for drouin. Drouin on matthews wing would be dynamite. Also drouin is better in the playoffs.
Contract:
I don't know why you would trade Drouin for Nylander based on contract considerations. Drouin has five more years left on his (six-year) contract at $5.5 per year. For six years, I don't see Nylander getting more than $6 to $6.5. That's at most an extra million, and you get one more year!
It's odd that Drouin's $5.5 million a year contract is appropriate when, at the time of the signing, his two best seasons were 32 points (4 goals) and 53 points. If that is a good contract, what should a player coming off back-to-back 60-point seasons get?
Playoffs:
We're talking about small samples here. Regardless, I don't see much difference between 8 points in 13 games and 14 in 23 games.
Complementary Player:
You know who would complement Matthews better? The better player.
In games tracked, Nylander has very good zone entry and zone exit numbers, too.
Also, for flexibility, Nylander was 51.4% at the FO circle last year while Drouin was at 42.5.