I used to play a lot of survivor mission to make to the NFL before the achievements came out, I don't do it anymore because it's such a waste of time, and I can tell for sure that takes more than 1 hour to get 1kk points, more than 2 hours even, but let's pretend the guy can make 1kk/hour, it will take 200 hours to make that score, that's something between 8 and 9 days playing straight, and its multiplayer, where are the teammates? Not talking about the exactly 200,000,000 score...
I'm not saying that the guy need to be banned, that's Gaz who decide, but Gaz need to verify this, and see if the person is using something ilegal.