Don’t put a lot of stock in what PM says in public, much of it is misleading or outright BS.
His MO as a coach is that skill is something he’s only interested in for the players at the top of the roster. He only wants 2-4 skilled forwards and 1-2 skilled D-men. If a young skilled player doesn’t capture one of these spots then he has no particular interest in them. He wants to fill out the rest of the roster with physical players and grinders.
We’ve seen the same issue with basically every young skilled player coming into the lineup. Morrissey, Conner, Ehlers, Roslovic, even Scheifely were clearly ready for the NHL or for top roles in the NHL but PM would only use them in limited roles or wouldn’t put them in the lineup at all until injuries forced his hand. Hell, even Byfuglien had to overcome this. This isn’t a pattern that started here either, it’s been a complaint about him everywhere he’s been. It’s a major reason why none of the teams he’s coached ever developed real depth. Good, but not elite talents end up being shelved in favor of the Bitettos of the world and never get the NHL ice time they need to develop into good NHL players.
If the pattern holds then PM simply will not play Niku unless there is a season ending injury to Morrissey. Even if that happens, he’s not quite good enough to step into a top pairing role, so he’ll fail and be relegated to the press box.