Fair enough. I do understand how it could be a pain to always have to update the leaderboard all the time.

I also think we'd need a new leaderboard. I don't know how true this is for the rest of the cast but Sora's moveset changed. The old runs make use of his fair, which is now completely different: it lifts you up into the air slightly / stops some of your momentum, and changes the pace of the runs because you have to resort to neutral air to not get slowed down as much. The hitbox of the fair also used to go all around Sora, when now it goes mainly in front of him. If you compare my latest run on Breaking Targets Level 1 (6.430 when it'll be approved) with the closest one in the leaderboard being also 6.430, the difference is pretty noticeable.

EDIT: Grammar and specificity about the new fair.