Ya. It's really weird but from my analysis, watching, etc. Morrissey is the largest issue for the Jets.
Pionk looks like he can be the guy on a top4 pairing if he's given the right partner. I think he's meshed well with Forbort, which is a good sign as I think Samberg's top end is a much better Forbort.
So then you have one more top 4 pairing you need to figure out. Morrissey-DeMelo is fine to get into the POs in the ND or be a fringe PO team most seasons, especially with Jets strong Fs and Gs, but you need better there if you want to truly contend. DeMelo has looked to be the stronger of the two, although he's also the one that moves to softer mins when they are split, not the other way around.
I think DeMelo can be the guy for a pairing, but depends on the quality of the other top4 pairing and not sure that's the JEts. Forbort-Pionk, I don't think so. Samberg-Pionk, maybe but that's a lot of guess work.
Looking at both chemistry, microstats, and quality, I think Heinola actually projects as a solid partner for DeMelo.
If Heinola can be the stronger of the Heinola-DeMelo pairing, and Samberg an upgrade on Forbort, then you have a decent top 4 that can be placed in most situations: Heinola-DeMelo and Samberg-Pionk.
There's three issues with that:
1) You are dependent on the IFs with Samberg's and Heinola's development.
2) What do you do with Morrissey then?
3) There's nothing there in the short run as the Jets seem content letting Samberg and Heinola perculate in the AHL.
Maybe placing Morrissey on the 3rd pairing with everyone healthy will help him get back to his old self. I don't think Poolman or Stanley is the guy for him on the third pair, and definitely not Beaulieu. I think you need someone who likes to carry the puck more than Morrissey. He's fine at doing it but it seems he's done better when he's had more assertive guys like Trouba and Byfuglien, and even Myers to some degree.
Given how injuries work in the NHL, your 5th best guy plays top4 mins almost as much as they do on the 3rd pair. And Morrissey is a guy that can play PP and PK, but I think I'd lean Heinola and Pionk on the PP over Morrissey.