The barrier for Sora joining the battle was quite high. In fact the negotiation team might have thought it would be impossible.

Sora joining Smash is actually the result of a lucky meeting between Sakurai and one of the heads of Disney at an award show. 2/4 pic.twitter.com/glBJVn8Gny

— Will (PushDustIn) (@PushDustIn) October 20, 2021