I feel this sort of thinking is restrictive.Ridley no longer too big, just too wide.
Even if there was no way to have Ridley with a smaller hitbox than any current Smash character, so what? Did we cry foul when Olimar was smaller than any other character? Some characters have big hitboxes, some have small hitboxes. There are plenty of fighting games with size differences more extreme, like Rocket Racoon vs Sentinel in Ultimate Marvel vs Capcom. There is no limit as long as their size doesn't break the combat system of ground attacks, aerials, and grabs.
This is like saying "Rosalina and Luma can't work because a similar character hasn't been done before!" If we only allowed new characters that fit the mechanics of the old game, we'd never get anything new.
I'm looking at the Smash Bros site. The border of the pic says 3DS, but the image is Rosalina, Peach, and Mario in the Wii U version.Are you looking at Miiverse or the Smash Bros site? The Pic is on the smash Bros site.
EDIT: And now I can see the pic after another Refresh. Hmmm... The background is really pretty. Samus's missile seems larger than it was in previous games.