But what would differentiate these Ridleys? I mean, think for a minute.
Link and Toon Link have radically different art styles and body-types. They come from very different roles, one being the Hero of Twilight while the other is the Hero of the Winds. Although both very projectile based, their differences go beyond narrative: one is built with vertical survivability and long reach on the ground, while the other excels at aerial-based gameplay. Even without understanding why there are two Links in the first place or understanding any of the Zelda lore whatsoever, they're very distinct from one another. Link and Toon Link. Simple as can be. Also worth noting that Alfonzo takes over whenever Toon Link is on the Spirit Train.
Alfonzo: "Leave it to me!"
The Donkey Kong we play as and the Donkey Kong we avoid in 75m take this even further. They look nothing alike and exist as different entities altogether in both function and narrative. Without having to play the original Donkey Kong, one can look at the two and say "Oh, that one is 8-bit DK! The one over there is me!" It's extremely straightforward, even to the most casual of players. Donkey Kong and 75m Donkey Kong, Donkey Kong and Cranky Kong, or Donkey Kong and 8-bit Donkey Kong. All things that can distinguish them.
Then we get to Ridley. To those well-versed in Metroid lore, it wouldn't be hard at all to see the two different Ridleys as separate things. One's a boss, one's a character. One was in Super Metroid, one was in Other M. However, to anyone who has not played these games, there's quite a bit of loss to be had. First of all, beyond one being a character and one being a boss, what separates them? The appearances? If that's the case, what does one call these incarnations? Ridley and Pyrosphere Ridley? Super Metroid Ridley and Other M Ridley? Ridley and Boss Ridley? It's not hard to understand, but someone jumping into Smash Bros. and learning about Metroid for the first time would easily be confused as to what makes the Ridley on Pyrosphere that much different from the Ridley you play as, considering not only are they both large purple space dragons with long tails and 3D models, but they are in fact the same character.
Considering how Sakurai felt it was a necessary design choice to replace a version of Toon Link whenever he is seen on the Spirit Train despite the two looking different in appearance, I find it hard to imagine Sakurai wouldn't do the same lest Ridley get attacked by some sort of unplayable Ridley. I hear you thinking "Why not just have stage Ridley not appear at all when someone plays as Ridley?", and I'll answer that with another question: Why have Ridley as a stage boss in the first place if the function of the stage will be hindered by the appearance of one character? Unlike Conductor Link and Alfonzo, the replacement or lack of Ridley would not be purely aesthetic. It would require more accommodation to function and would take up more development time as a result. So if the solution to have playable Ridley is to remove the established Ridley beforehand,
it completely contradicts the purpose of having the boss Ridley in the first place.
Additionally, all the characters in each series (with the distinct exception and actual gimmick of Toon Link) follow a set artstyle. All the other Zelda characters had their Twilight Princess designs. Olimar and Alph appear as they did in Pikmin 3. The Kirby characters follow a set rounded, lighter, more expressive bunch of designs reminiscent of the Kirby anime. Pit and Palutena take their appearances from Kid Icarus Uprising. And so on. It would be a more than reasonable assumption that Falco would have his Command/Brawl design like Fox does as well. If Samus and Zero Suit Samus are both based on their appearances from Other M, and then Ridley suddenly appears as he did in Super Metroid, that creates a sudden dissonance in design. It would only make sense for Ridley to be playable in his Other M incarnation to match with the Samuses. Based on that clip of Ridley, we know the shadow is that of Other M Ridley, however, so that eliminates the possibility of Other M Ridley being DLC. That leaves us with two scenarioes: The playable Ridley is Other M Ridley sited in the Smash Direct, or the 3rd Metroid character would be one of the only characters in the entire roster to not fit the artstyle of the rest of their series. With this being said,
do you think it is legitimately realistic that Sakurai would former the latter based on what evidence we have thus far? I will not lie with you here. As much as I want Ridley to be playable and as much as I like Ridley's Brawl design more than Woody Woodpecker from Other M, that
really seems like a stretch to think Sakurai would specifically go against the aesthetic he had set up. Had Brawl Ridley been the one we saw in the Smash Direct with the possibility for Other M Ridley being DLC still existent, I'd be a lot more inclined to agree with you.
If you really read all of that, I appreciate it. If not,
I'm going to stab you you little **** the tl;dr is that Other M Ridley being a stage boss while Brawl Ridley is playable has way too many discrepancies to seem plausible. Had any of the conditions been changed, such as no shown Ridley on Pyrosphere whatsoever, the Ridley on Pyrosphere being Brawl designed, or Samus appearing as she did in Brawl, it would seem possible to see the DLC scenario you're setting up as possible, but all of these "barriers" of sorts make it seem merely like a pipe-dream. Again, I came to this conclusion with logic despite
being a Ridley supporter. I want to find every bit of evidence I can to seeing us get Ridley, but I will not remain blind to the facts that lie before us. Ridley is simply not fit to be a DLC character already knowing his existence in Smash 4. Same-identity characters do not exist as both playable and stage bosses. Characters of a given series will follow a similar aesthetic. Ridley was already shown
in the game with his Other M design.
He is either playable or not. There's no middle-ground with the facts set before us.