As long as he displays what appears to be a lack of effort or the ability to engage in the play, he will not play on the 1st line - I'm really surprised this is even being debated.
Okay, but gold-plated first-liners Wheeler and Scheifele, and sometime first-liners Ehlers and Connor have been criticized for this exact thing, last season and this one, and will be again I'm sure. I agree that Laine has looked bad-to-brutal at times this year and I'm not sure what to make of it, but I also think he's a very cerebral player who is still trying to work out his game. I think playing him with Copp and/or MP might be worth a shot, because I think it's hard to play with MP and not get involved, and while Copp isn't a great finisher his skating, positioning and IQ are so good that Laine can blow a play and not give up a goal doing it. We are a duller, leakier, less creative team this year by my eye-test and those of quite a few of my hockey-watching friends. We're winning, but we're rarely inspiring like last year, IMO. A Laine at the top of his game is a difference-maker who buys a ton of freedom for his teammates and helps elevate the team. I think this a problem that needs to be solved.
And I'm not that fussed about the 1st-line/2nd-line thing, although Laine may be. I don't think it matters much how hard he plays or how many board battles he wins or how much he "plays the right way" -- he will not dislodge Wheeler from the right and is unlikely to shift Connor/Ehlers from the left. As long as Wheeler can eat 24+ mins per game, and 55 prefers to play with him, Laine is a 2nd-line player for the Jets, IMO, even if he's our best player (which he often has been). And to PoMo's credit, I think he's perfectly happy to see Laine score a ton of goals and set up a bunch more while losing the odd board battle. But there is a pressing need for that 2nd line to produce, right now and for sure in the playoffs.