If I'm management, I'm entering that training camp with a clean state mindset. Aside from Matheson, Savard and Ghule, all the remaining 4 spots (including the 7th D) are wide open. We are reconstructing our D, and we need to identify and give opportunities to the best prospects we have.
There's a recency bias in thinking that the guys we have seen "make it" in the last few years - Xkekaj, Struble and Barron to name them, are necessarily higher in their development and "deserve" to have the benefit of the doubt and start their season in the big club. But these guys benefited from how bare our defensive depth was 3 years ago, they had a lot of opportunities compared to many other prospects in other teams, and compared to the new D prospects coming up now.
While they can always continue to develop, they are much closer to their peak than we might hope they are, and there's a danger in being too patient with them while keeping actually better players in the AHL on the excuse that it's good for their development. I get the idea , but in practice, you don't really learn how to play NHL hockey outside of the NHL.
I think we need to be ready for our own assessment of the D depth and pecking order to be drastically changed in the next two months. For example, I wouldn't be surprised at all if, by the end of training camp, Reinbacher or Mailloux or both make the team out of a strong showing, completely outshining Barron.