Let me break this down into two different score performances.
First, a player reaches the killscreen but later learned that they were award their 4th man upon reaching the 10,000 point threshold instead of at 7,000, where they did not lose their 3rd man prior to 7,000. Do we reject this legitimate performance? No, we do not. There would be no reason to reject this game performance because for the present submission the point threshold was irrelevant.
Second, a player was practicing on 5+ 1 settings but had an incredible break out game. He reaches the killscreen and losses his 4th man. That score which he achieved after his 4th man is a legitamate score and the game performance exceptional. Do we reject this legitimate performance? No, we do not. There would be no reason to reject this game performance because there is no advantage since they are only playing out 4 men as one would with 3+1 settings.
This is the spirit of the normative/auxiliary rules. This is why they were created in the manner in which they have been created.