I'm not banking 100% on it but it's hard to ignore how much she's taken over the franchise
Yeah, I know that. She’s pretty big, and is probably what would help her in the long run if she’s an echo.
The only thing I really have against her is the fact that there are probably a lot of other more obvious echoes I think the team may have decided with before settling on her. She lacks having similar proportions to the current Villager that might cause the team to overlook her, when you see the other echoes, most of them have very similar or the same proportions with the exception of Lucina, however Lucina’s are barely noticeable.
This is also carried over to some of the other likely mentioned echoes where Ken, Felix, and Shadow have the same frame as their counterparts. So they might’ve been realized much more sooner than Isabelle, not to mention that she also has an assist trophy role that the team might be fine with.
Although I wouldn’t say lacking the same proportions is going indefinitely keep someone out from being an echo, it definitely helps as it can be caught by Sakurai a lot more sooner. All of the echoes show this.
This and the fact that I doubt that they would make her a unique newcomer since she doesn’t really do much to pull an interesting moveset from.