I think keeping Larson, Severson, Gelinas and Merrill paired with a vet would help them out more than if they pair any of them together.
As an example I looked at a defensive pairing Toronto did a for a bit with Gardiner and Reiley, and it was fun to watch them with all their energy, however it came at a cost being their defense.
NJ should look at keeping these guys separated for a few years till they mature a bit, and learn from a vet presence on the ice.