The Recalibration of MMR for the new season will only consider win or loss for the player. This is done in order to reduce the reliance on statistics which are usually tilted away from the supports. This is definitely a progressive move which will help players in the new season.
Re-calibration only considers win/loss, relative team rank balance and the estimated uncertainty on your rank.
In-game performance does NOT affect the calibration credit you get during the calibration period.
So carry or support – Win or loss is what matters. Nothing else.
— Wykrhm Reddy (@wykrhm) June 6, 2018