tbqh I think 70% is a bit far, if 70% is Mario-related then there'd be no doubt that it'd be a spinoff (and the oblivious boomers who call it a "Meh-rio" game would be right). It's more like Mario gets 15% while other franchises get between 2% and 10% of the content. Also remember that it's 14 fighters out of 81+. Yes, the Mario franchise does have a larger presence, but no, it isn't to the point of dominating the roster/game and clearly showing itself as the host series.The Mario franchise has such a disproportionately large presence in it (for example, even counting Bowser Jr. and the Koopalings as a single fighter, that's 14 fighters), which is only rivaled by Pokemon's (which is almost entirely devoted to a single support item). While a Zelda or Metroid wiki could easily get away with covering just what's specifically relevant to the few entities from them, Mario's is just so intertwined throughout that'd be basically impossible and, if it were attempted, would just look like it's covering 70% of the game while being too lazy to finish up.
I don't think he said that Palu/Bayo would be starter characters. I think he just said that they were the only characters that would possibly survive Galeem's attack. Also if Mario were the starter character, you could easily make an argument for him.Sakurai's stated he wanted Palutena or Bayonetta to be the starter character for WoL since they're OP in their origins, and both of them are from low-tier franchises. He went with Kirby solely due to being beginner-friendly.
I think it bears noting that the "fighters" is only the tip of the iceberg. It was the only franchise to get multiple stages in the original, and counting spinoff franchises, it got 5. (Peach's Castle, Yoshi's Island, DK Jungle, Mushroom Kingdom, and the unselectable Meta Crystal) Also, all the trophies and stickers in Brawl are also disproportionate. And I never said it's a "spinoff," just a crossover where Mario has a much larger presence than the others.
im also 100% sure kirby was included in that. he picked three characters that could viably survive, and out of those then chose kirby because hes the most viable to start with gameplay wiseI think he just said that they were the only characters that would possibly survive Galeem's attack.