I think Mack would agree with me that if someone takes the name of the 9y, and they are legitimately trying to form a good regiment, then there would be no problem from anyone of the former 9y. The problem, however, comes when someone takes a name and deliberately trolls/makes a bad name for themselves while using tags that previously were held dear by some people in the community.
Not saying there should be rules or some kind of intervention, but I sympathize with Mack's disappointment.