You mean like how he said that he did not want to include realistic guns, fighters from other fighting games, and Ridley?
...And then you went on and on defending your statement about "whataboutisms" and whatever and blah blah...
But I'm here to outright
refute your belief that Sakurai actually said "No" to Ridley. That this a myth born of misconstruing Sakurai's words (who dah thunk?)
Not one, but twice has pre-Ultimate Sakurai clarified his stance on Ridley. Which basically amounted to "We
could make Ridley playable, but we'd have to make significant compromises and diminish his integral design." Not the same as an over-simplifed "Ridley can't be playable."
If you recall, Sakurai has gone on to explain things depend on what he's able to envision at the time. That goes for not just Ridley but for Little Mac, Villager, and Pac-Man. All of these characters were never an actual "No", but an "I can't see them working at this time." In these instances, their futures were unclear, but people in the community just HAVE to insist Sakurai is putting his proverbial foot down. It's gotta be "No, won't happen, will never happen". Black-and-white mentality which definitely pervading within the speculation community.
When it came to Little Mac and Villager and Pac-Man and finally Ridley, what simply happened is Sakurai got the vision he needed. Little Mac just punching everything was just fine, Villager wasn't "too soft" to fight, and Pac-Man required some serious creativity. Then Sakurai, always aiming to please his fans, finally responded to the outcries of the Ridley fanbase (who clearly disagreed with his previous stance), buckled down, and produced a very acceptable playable form of Ridley.
Over time Sakurai has realized it's often futile to say "it probably can't work", 'cause he's proven himself wrong on more than one occasion...
BUT this is one thing, and a CLEAR and CUT line has been draw for this particular instance. It had already been drawn before, but people can't seem to tell the difference between "not sure if possible" and "Not Gonna Happen". Goku, Spongebob, Iron Man, any character that didn't
originate from a video game or were born for the purpose of the video game medium are not in the cards. At all.
The Smash Ballot disallowed non-gaming characters. Sakurai
laughed about Goku and Spongebob requests in an interview. And now he has straight up (re)drawn the line between gaming characters and non-gaming characters. I expect people will now (continue to) try and blur that line with mental gymnastics about how "so-and-so character has X amount of games, they count" or whatever. But those who can actually discern Sakurai's statements already realize that a character's origin tells their medium, as does general public perception (e.g. "Goku" is manga/anime, "Iron Man" is western comics, etc.).