I think that both Wheeler and Maurice would prefer to have him at RW, with Scheifele to the most part.
A lot of the Jets future depends on Laine's development. Does he plateau at the level he showed this season, with more scoring? Or does he take another step or two forward as a line driver, to go along with his scoring? The same applies to Connor. Can he take a step forward in his play in his own zone to make him a more positive in tilting play?
If those two forwards take another step forward, then the need for a play driving 2C becomes less important. I'm still not convinced that the Jets can't use some combination of Little, Copp, Roslovic, Harkins in that role, if Laine can become a strong enough play driver to play on the 1st or 2nd line.
In the end, teams tend to have success at even strength in one of two ways: 1) have one overpowering line that out-scores their match-ups, and have the other three lines play at least even vs their match-ups (the Bruins model); 2) have a more balanced line-up, with each line out-scoring opponents.
Generally, top-echelon teams will out-score their opponents by around 30-40 goals at even strength. In 2017/18, Scheifele's line (mostly with Wheeler and Connor) was a net +20 or so at ES, Little and Stastny ended up around + 10 (together), and the rest of the lines were at around +10 (mostly driven by Lowry/Copp).
Going forward in the short-term future, I could see the Jets looking for something similar.
Connor-Scheifele-Wheeler (find some good match-ups and expect that they can outscore by +15)
Ehlers-Little-Laine (further development by Ehlers and Laine, some softer match-ups, with Little providing D cover to get to +5)
Copp-Lowry-Roslovic (a healthy Lowry and some punch from Roslovic, tough match-ups, manage +5)
Perreault-Harkins-Appleton (a responsible, fast line with some punch that can outplay most 4th lines +5)
Continue a strong penalty differential and have a hefty advantage on special teams.