Regarding Skull Kid... Yeah, we know the ballot is important and that it is being taken into account but I am pretty sure Sakurai interprets the results not only takes them in as they were. Sakurai knew Skull Kid was popular because when his AT was shown for Smash 4 he clearly let people know he was an AT and not a playable character, so he knew. And taking into account only Smash 4 context just doesn't seem fair at all, K. Rook got a Mii costume, Ridley was still too big and left as a stage hazard/boss. Like yes, I do think Skull Kid's votes got hindered as he was already officially deconfirmed for Smash 4, but we don't know how many votes he earned at the end, besides of what has already been mentioned, Sakurai could have chosen one new Zelda rep to please all who voted for a Zelda newcomer independently of who. Majora's Mask is a very popular Zelda game, Skull Kid and Majora's are dearly remembered by people and their remake hit just on perfect time for being considered into the roster. Maybe they are also picking him (if they did) to appeal Zelda fans that aren't in the Smash circle yet, for example