Since you're serious about hoping, then worry not my friend.
With Evander Kane, you already have a great idea of what you're getting. I'm not ruling out that he doesn't have the ability to produce more, but we've likely seen the best of Kane. On the other hand, Yapukov oozes talent, but isn't showing that he can put up solid numbers right now. Fans might think it's the old, change of environment that could help Yapukov be in a situation where his skills could shine.
Niederreiter had 3 points total in 64 games with the Isles. Only 2 goals. Then in 133 games with the Wild, he had 61 points, 30 goals and he's still only 22. All pure speculation. Imo, the attitude stuff is going to scare Tallon away from the Kane situation.