Even if chat was limited in game to the person you're facing directly, you can't stop the collusion from outside chats. If you face someone in the same guild as your next GA opponent or someone who shares a shard chat or some other sort of other connection they will always be able to chat and tell you what they placed on D. Limiting your chat to just the one person doesn't stop them from chatting outside the game. That and knowing the name of all of the people in the bracket vs just the one name of the person you're facing for 24 hours prior to attacking doesn't change a whole lot either. That person still has 24 hours to contact someone outside of the game to then go and try to find you. Don't really think this will actually avoid collusion. Most people aren't colluding like this at the moment, and only the ones who really want an advantage are doing so, and those people will still be doing so even if you limit their in-game communication.
