Hrqls: as those matches are calculated as a draw i would expect 2 games with the same player, directly after another, win and loss, have the same result as the 2 game match which was a draw

No, that's not what I expect. There is a difference between two one-game matches, and a single two game match, and that's the fact that in with the two matches, there's a rating adjustment after the first match, and unless there was no rating adjustment, the ratings of the opponents at the start of the second match differ from the ratings of the opponents at the start of the first.

Compare it to interest on a bank account. Say you have an account that gives 10% of interest a year, you have $1000 on that account - and you keep the money in the account for two years. How much interest have you made in those two years? $200? (10%/year of $1000 for 2 years) Or $210? (10% of $1000 for the first year, 10% of $1100 for the second year). Or even $215.50 (interest added every 6 months)?