Decided games × (win rate − field average): wins taken off the rest of the field beyond what an average Spearhead would have taken from the same number of games. A 60% Spearhead nobody plays moves the meta less than a 53% one that is everywhere. Mirrors are always excluded here (a mirror can't take a win off the field).
Average (points scored − points conceded) per game, across games where BCP recorded a score for both players.