For 19, Joki was a good player here. He would've been a good player here this year. There is no evidence that the Hawks liked Mitchell more than Joki.
The Hawks took a chance on Nylander. At times, he's looked worth taking a chance on. At other times, he seems like a 3rd line liability.
He'll keep a spot in the top 9 next season because his upside is too high to ignore. It's up to him if he wants to stick around longer than that. We've seen him be one our best forwards during a couple of good weeks earlier this season, so all we can do now is hope he can learn to play like that somewhat consistently.