I'm not sure, but...
I looked at it in Theater Mode just a while ago by sending him a FR and looking in his recent games. It was like in his last 2 or 3 games played. I don't remember the date the game was played and don't have access to my xbox right now to look again. But I don't think they show up in a players "Recent Games" list but for a week, so I'd guess if I went back and looked it would be a very recent game.
Nobody can make any kind of code that is hack proof, so why should this game be any different.
People are able to easily hack into some of the most expensive software out there.
On resetting boosters you only have seen a very small portion of them because they post it on the forums. There are a high majority of people that got reset that dont post on the forums. Problem is because they need multiple reports on a person before it is investigated and most people wont report a player for cheating. They either move on or complain on the forum because their one report wasnt listened to. I blame the people that made the false reports before for the mess we are all in now.