Actually it's because you ragequit your previous game and that match was still going by the time you got Covenant and Bissonnette. So your massive ELO drop was because of the ragequit... that game finished ofc by the time your Covenant/Bissonnette game was finished, making you believe it was the latter game that made you drop so hard
I must admit it's much easier to debunk your wild claims now that we got your playercard