First off, William Nylander is an elite player. He is coming off a 40-goal 87-point season where he drove a lot of offense on a loaded Leafs team. On top of this, he is a playoff performer posting 10 points in 11 games last playoffs, and has a career total of 40 points in 50 playoff games, very high numbers considering how many playoff chokers there are in Toronto.
Morrissey is coming off of a massive season where he scored 76 points in 78 games. While this is fantastic, it is quite unlikely that he replicates these totals as his previous best was 37 points. If the Jets expect Morrissey to regress to the mean, he may be on his way out.
On top of this, the Jets also get rid of Ehlers who is coming off of an injury-riddled season which saw him post only 38 points in 45 games. He is also a player who is notorious for going missing come playoff season where he only has 12 points in 32 playoff games.