I don't think I'm watching the same games.
Kadri has been good and has had fantastic games at center before his concussion. The only thing that is killing him is his low S%. And the post. He is also an awful winger.
I kinda have trouble understanding why you guys would want your 7 million dollar player (yes, it matters) being wasted on the third line when he should be playing alongside Matthews (also, I never like to judge a player based on a small sample size, so I would not move Willie to center just because he has played 4 games down the middle).
He can play wing as well as center, so there aren't any issues with that. It's good to know that he can fill in in case of injury, though, but ultimately, he should be in the top 6.
re: pp
I don't think Naz is better or worse on the pp than WN. What's happening is that the Leafs haven't found a way to use him effectively enough.
I think Kadri will be here until 2023, and then the Leafs will reevaluate if they want to re-sign him or not (TDL).