My Hero Academia's fourth season has had its fair share of big reveals over the course of its few episodes, and one of the biggest was how All Might actually worked alongside a sidekick several years before the beginning of the series. AsMidoriya officially begun his work study under this former sidekick, it turns out that the falling out between All Might and Sir Nighteye was a bit more complicated than initially expected. It was odd to see such an All Might fanboy willingly stop working with the number one hero, but it was for All Might's own good.