Brave Girls are a very iffy case. I'm not super familiar with them or their circumstances, but if there weren't any original members left by their 10th anniversary, I'm not sure that should count. I would probably be hesitant to count any group that's lost most of its original members, but there should be at least one left. Otherwise it might as well be a different group altogether.
Mamamoo... ehh. The thing is, a lot of groups these days don't officially disband, but in reality that's what they're doing once they leave their company and go inactive for long periods, until it's time for a reunion. They're likely one of those cases at this point. So I think whether or not they should be penalized for not making it to ten years before this happened is highly debatable, but at the very least, I would put an asterisk next to them. If they actually promoted for their 10th anniversary I would take a more lenient stance, but they didn't.
Kara & EXID were inactive long enough that they could be considered effectively disbanded. Same goes for groups like T-ara and 2NE1. It's nice that they got back together, but I wouldn't count them.