The Canadiens' defensive situation is quite complex, with many young talents competing for a spot on the roster. Jayden Struble, in particular, has made a strong case for himself, while Mailloux, despite his undeniable potential, may need additional time to develop in Laval before joining Montreal.
Even if Mailloux starts in Laval, it's likely that he will make his NHL debut during this season, especially if Justin Barron or other defensemen encounter struggles.