I hate to be that guy, but this is nothing to be congratulating him or her for.
There are two ways he reached this.
One, boosting with someone who has a kill hack.
Two, he did play legit. And think of how much time that took. I'm a huge gamer myself, but this takes AGES. Literally AGES. In KSF it's more accepted because of their culture. Think of how much time he wasted. He could have lost his virginity.
He kills the afk in Venezia, his friend rushes, and a leecher gets APs.
He has 4+ computers, I was in one of his games, with 260% I got around 2,380+ exp with APs and a whole game is less than 5mins
Forza_UK can probably get more than 5.4k if he gets HS 5% EXP, 30% SPECIAL POINT, and 260% exp