The Smashers Have Been Turned Into Children?

Poor, poor Ganon. He has to deal with all the smashers as children ever since Tabuu turned back the clock for them by ten years. Ganon, however, was spared from this plague. Why? And why did the most annoying smasher EVER also have to stay an adult as well? Everything was going relatively fine until Tabuu started attacking the Smash Mansion to try and kill the children smashers...