There is a guy, i think is name is ILOGAIN, who has an average KD above 8. He has lots and lots of games played, so he's not just someone who happened to go into 5 games and get lucky. I have no idea how he did it, but when you look at his profile it gets a bit weird. His most used weapon? A MACHINEGUN. Yup. He has more Decisive Victories than regular ones, and he has a Flawless emblem even though his only level 34 character (others are sub-20) has never played Trials. But yeah, getting that high of a KD is very very hard, you're right about that.