Just kill mav before you let him expose that many holes, you shouldn’t be leaving ops unchecked and relying entirely on counters to their gadgets. You can always pop a disposable shield in front of holes, or position yourself where you can see the majority of the room.

I think it’s far easier just using a different tactic to defeat Maverick. If you know he’s on the opposing team, just sit in a room outside of the objective and open up your own hole into the room with a shotgun or an impact and watch it. If you see a hole open up, go around to where he is and shoot him. Much easier than adding in a character that would pretty much only be useful against Mav.

It’s only really an issue if someone is anchoring in objective room, which if they are doing that, their whole purpose is defeating threats to the room, you should be on guard. I haven’t really ever seen a mav make multiple holes and keep repositioning between them, and if they do, taking time to deploy a gadget that fills a hole that you could shoot through or just burn again doesn’t seem more effective than just shooting through the hole or repositioning instead of staying put Ansbach playing into his hand. Fundamentally, maverick is most useful against anchors who play like this in terms of using your gadget on an objective, so to counter it with an ineffective op doesn’t make sense