I wonder if before Sonic's inclusion. Jigglypuff was meant to be the one to break Tabuu's wings.....
that would've been an Awesome twist!
Obviously the Mii Fighters were planned to be in Smash 4 from the start, and I love them and am super glad they're here and don't want them to leave,
But clearly they had a different development cycle to the rest of the characters to be added in, and since the comparisons are more direct and parallel than, say, a game mode, given the assets they're made of,
How many characters could they fit in the playable roster if they didn't decide to add the Mii Fighters?
Developmentally they are 3 different characters with one spot on the selection screen.
each Mii class has it's own standard moveset thus standard animation set that comes consistent across each fighter in a class, so 3 packs of standard animation.
Each has 12 unique special moves, totaling to 36.
Each has 7 costumes, one for each gender which is 14 bodies for each class plus 12 possible Mii colors on each,
which totals to 42 bodies, 504 textures for the Mii Fighters
And each is generated, thus scaled in size, speed and power, proportionally to the size of the original Mii.
Then the heads, which come as standard Mii assembly programming, plus the inert headgear.
So
3 standard movesets
36 special moves
42 bodies to map the animation to,
504 textures to map to the bodies
How many characters could the dev team make with these assets clear?