It's not wrong, though. At all. Daisy being introduced as the latest Echo Fighter is doing nothing but a PR statement. It doesn't change anything we know of development. There is literally no reason to think so.
If you literally choose to not think as a game designer how game development works, no there is no reason to think they are handling clones differently.
But if you actually consider and think about why Echo Fighters are thing, it makes WAY more sense to plan clones as a "feature" from the get go so you can add new characters to a game where your resources are primarily going towards adding old fighters. We don't know this, but if you THINK about it, it makes more sense this way.
There is nothing to suggest Daisy wasn't last minute either. Lucina was shown off to introduce that clones were back essentially in 4. In fact, she was used as a perfect example of why "clones" get their own slots no matter how little the difference is. That's how she was used as a PR statement overall. Nobody knew how she worked till Sakurai explained further. He himself did not elaborate on Daisy.
That said, I forget about that translation error. But that was from a Miiverse post to begin with. Not from two employees talking without somebody being translated to our knowledge. There's kind of nothing untranslated we know of to take from, which means there's not really a good reason to believe Bill is misunderstanding something.
Lucina was a costume first and foremost, her presence in the trailer was because she was already planned to appear in the game, just in a different light. Even then, Lucina was introduced as a clone fighter first and foremost. There was nothing special specifically about her character being explained, it was literally just "yeah shes a clone".
The whole CONCEPT of clones were reintroduced. I don't understand why you cannot comprehend why this is such a big difference from previous situations.
No offense to Bill, but he's mostly just a player like everyone else. He doesn't help make the game, he plays it and (likely) translates for it. But that doesn't mean he knows why and how everything works in it. Just because have an absurd amount of hours playing Mii Gunner doesn't mean I know the reason why Sakurai designed her this way or that way, Bill may have the ability to ask these questions to Sakurai, but he is not a game developer for Smash Bros.
There is nothing to suggest this is really a big difference. We already knew they can have some unique animations due to the taunts being different. Daisy showed little to begin with of note, that, gasp, only their moveset has to be almost entirely the same with tiny tweaks. We already knew that. Daisy was also not actually directly explained about that from the getgo. Bill noted that. He's the only reason we even knew they could have other animations. We were never led to believe that the animations for things other than the moveset had to be exactly the same so this is hardly meaningful to begin with.
What? Have you not even played Smash for 3DS and Wii U???? Where the heck is this interview with him? Because if anything it's probably just him restating what already has been stated. And, again, Daisy has a unique IDLE POSE, which is something ALL of her attacks need to transition FROM and INTO. This requires A LOT more work than for Dark Pit and Lucina did in Smash for 3DS and Wii U AND Ultimate (as they still share the same idle pose and animations for Pit and Marth from 3DS and Wii U).
The idle pose is similar to Peach sure, but they need to make sure the transition frames to and from her idle pose works with
each animation she does for everything. The pose needs to transition into an attack stance, and all of them need new follow through poses after the attacks are complete to return to her unique Idle Pose. Sakurai held a
GDC panel in 2008 for Brawl's development which perfect explains this process. This requires a lot more work than it did for Dark Pit and Lucina, because now every animation needs to be tweaked to match this new pose for Daisy.
I'm taking a moment to tackle your opinion of Isabelle as a echo fighter, which is again flawed. Because you refuse to think about clones as anything but afterthoughts, because of the previous titles.
I'd like to reiterate that there is absolutely no reason to think that they wouldn't try to plan clones for a game where their focus isn't adding new characters, but bringing back old characters. They know people still want new characters, and the easiest way to add new characters is to add low effort clones. There will still be brand new character concepts, as the Inkling and Ridley show. But in order to beef up the roster size and make players happy, they can still add Clones to make certain people happy.
There's no reason to think Isabelle doesn't fit in as a Villager clone. All characters in Animal Crossing can do the same thing, they're all capable of using the tools Villager fights with. Would Isabelle fit in is a fighter? Probably not. Does Villager fit in as a fighter? Not really. What matters most is that: do people love Isabelle and would love to play as her? Yes! That's what's more important, the inclusion of Ridley is a pretty obvious indicator of that.
And they can do whatever they want to make Isabelle fit the role because should have been planned from the start. Much like how Daisy likely was too, which allows for the time and effort to be put in so she can have animation tweaks.
That's ridiculous to even think it's a serious flaw to begin with. Until something proves it wrong outright, using the previous process is the only one to think of would likely be used. It doesn't mean it will, but there's no reason to believe otherwise than "Meh, he never repeats things." Except when he does. He has never once made a new clone outside of last-minute. Echoes are still clones. Why on earth should we believe this would change when it's a consistent 1:1 process. If not the most consistent one he's done every time. And in a twist, has so far been let known that every Echo are 1:1 animations for all their attack moves. Something that isn't proven wrong by Lucina and Dark Pit. It just means they don't have to have new animations. However, don't forget that the Final Smashes are strictly animation changes too, and were changed. We already knew that, along with taunts, means some animations don't have to be 1:1 to begin with. Daisy didn't show anything directly new. We basically knew it could happen, just didn't see it yet.
Just like we could get Echoes who aren't 1:1, but currently we have more evidence to suggest they won't happen. If somebody said Echoes would never get new Idle Animations, it would not be a bad argument as evidence is in their favor. Nobody is even discounting the idea that an Echo could be created off of a similar model. But it's unlikely due to the evidence we have. Daisy isn't exactly something that proves anything to begin with. You're forgetting that Ultimate has been working on for over 2 years. We don't know when Daisy was finished as an Echo. Or when she even started as one. We don't even know if she was an Alt first like the other two were in their debut. Could she be? Sure. Could she not be? Sure. But so far? There's not exactly any evidence to suggest she couldn't have been an Alt to begin with. She was already a type of costume to a degree since Melee. We already knew that. So it's quite possible she was an Alt already before being cloned off of Peach. Besides that, I never said this is indefinitely the case anyway. I said that we know so far that Echoes have been 1:1 to begin with, as we have an official statement.
Yeah, why should we think and consider things that are smarter for a game developer to do?
As for your example about AT's? This has nothing to do with Bill's statement. His PR statement was not some translation like that Miiverse post was. We don't know where he got the information. He don't know if it was a vague statement by Sakurai, as he wasn't there. Bill could totally be wrong. And that's fine. The thing is, his PR statement has nothing that explains the origins beyond his words meaning there's no real reason to believe it's a mistranslation. He even was using a proper analogy, as Megavitamins function differently from the Fireballs. People just didn't seem to feel they were nearly as different as they actually are. More importantly, Echoes have the same move functions with very very tiny tweaks outside of Final Smashes, which is kind of the main reason his analogy existed, as despite it seeming bad, he was using a fairly good example of how a function is kind of important to the difference between an Echo and Clone. But then again... maybe it didn't mean anything and he was using a legit poor analogy. Who knows. But why should we honestly believe Bill is incorrect? You can't really cite it as a translation error at this point. It was a separate statement with two employees that didn't have Sakurai there or an actual literal translator.
Bill is a translator. He doesn't develop the games. Everything he says is from his personal experience from what he has seen and played of it. Just because he says something doesn't mean he's correct.
Any Nintendo that's not Japan is translating information, and it is not without reason to believe that things can be very lost in translation, as the Assist Trophies in All-Star Mode shows.
The OFFICIAL NintendoVS Twitter just stated that Mii Fighters will have THREE SETS of SPECIAL MOVESETS, yet the FRANCE Nintendo Twitter stated that they will have THREE DIFFERENT SPECIALS for EACH SPECIAL MOVE.