I'd argue that's sort of the appeal to Calliope – that she's actually super awkward despite outward presentations and she stumbles over herself most of the time, but is sardonic enough to acknowledge that she's shit at a lot of things while still having the motivation to keep trying to succeed in spite of it. It's what gets people to start red Superchat trains in her streams , because she's almost TOO down on herself a lot of the time and people can relate to that feeling, so they want to show her that they love how she's doing things even if she's doubting herself. Plus, just straight up, old fashioned simping, let's be honest.
Amelia, on the other hand, feels forced in the way that she's trying not to outright be the actual goblin of a person that she really is. Except she's not really trying at all and her "toxic gamer" tendencies and general degeneracy kind of openly bleeds out of her by her own volition. And that's what people love about her, I think. It's alright to be a "toxic gamer" with "gross" predilections, tendencies, and vices if you're a cute 2D waifu. Amelia's pretty good at maximizing comedic appeal out of that side to her presentation as well, I'll give her that much, but her streams generally don't grab me like the others', which is why I tend to put them on as background noise if she's live.
Fubuki's at 925k right now, so she'll probably end up beating Gura to the punch. No worries there.
Not unless Gura manages the upset through pure shrimping energy.