http://warlight.net/LadderTeam?LadderTeamID=4198It really looks like a bug in the system. If indeed that is TrueSkill with mean of 1500, that guy ould never get >1900 by 50% win rate. Likely you added to him 1500 points flat, not increasing the mean.
ps. Best ladder so far, I am also grateful that autodistribution and 4ffa are there, prevents me from returning and playing :)