For example, beating an 0-1 team in week 2 might hurt your rpi at that time, but if that same 0-1 team wins out after week 2 you get your final, playoff-determining rpi based on beating an 8-2 team, and not one that was 0-1 when you played them. Your rpi doesn't go "up" or "down" per se based on any one game and when it its played: a team starting 0-3 and winning their last 7 (7-3 season record) will have an rpi of X, and if you flipped their schedule completely (same opponents and results, but in opposite scheduling order) where they started 7-0 and lost the last 3 (7-3 season record) their rpi would still be X; i.e. exact same.