I don't think Mete evolves into a forward. That's poor development.
I hope he sticks around until the WJHC camp. I don't see a reason to send him down before that.
He leaves the team hungry to get back. Maybe he earns a spot on Team Canada wins a gold. Then you make your next decision based on health and depth.
With Schlemko back the coaching staff now can use two reliable defensive pairs Schlemko-Weber and Alzner-Petry. But Weber is still the kind of guy you can double shift. Maybe he gets some offensive zone time with Morrow, or Jerabek.
I think you have to keep Jerabek up, he has that 1st pass that is missing, and he can defect if you send him down.
I would say the 5-6-7 d plays out as Morrow, Jerabek, Benn and there is a healthy competition there. I think Morrow has the advantage of having played for Julien before, which is why he gets the nod. His skating is as good as Mete's. I think the fact that Mete has neither consistently QB a PP or anchored a penalty kill makes him #8 at best. And that is on the outside.
What I'd like to see is him finish a junior year and come back next year to earn the spot beside Weber, with physical maturity, though I think 21-22 are the best years to graduate.
I don't know if it is possible given he has already played out his ELC, but if he could join Lavsl for a playoff run, paired with Lernout, a minor league version of Weber, I think it would benefit him.
I don't think it hurt his development to play professionally so young. I am sure it was a learning experience. I also think he proved himself the best option to start in Schlemko's absence, and development should push him past Schlemko, creating more competition for playing time among d.