This was the first team game of Eskilo. Before the game, their "ladder rating" was 1100 and the actual "current rating" 1500. After the game, "ladder rating" was 1126 and "current rating" was 1513. Additionally, the other players' ratings changed a bit due to the game. AFAIK, the balancer uses "ladder rating" before the game instead of actual rating.

"Ladder rating" has many strange deviations from the actual rating. That it starts at 1100 instead of 1500 is one of the few deviations that makes some sense: You want to balance a new player as below average but the actual rating average has to be kept at 1500 if a new player joins. This could be solved by an anti deflation mechanism: If a new player joins, their actual rating could start at 1100 and the ratings of all other players would be shifted up to keep the average at 1500. Then, ladder rating could be removed. The same mechanism can be used to prevent rating inflation if a player leaves.