From how it looked, I have about 2 right now, though could probably be more if I do a reread (which may be likely soon) or as I'm typing this.
Though could probably chalk it up to the style of the manga, it looked like at points that Yorihime was tanking the stars from Marisa's danmaku, was that due to the atmosphere having an effect on her power aside from the shining or was that something different like her just dodging?
The atmosphere didn't affect her power. It just made it so the stars didn't twinkle. Considering an ordinary moon rabbit
gets bonked on the head by one of the stars and is fine (and a couple of fairies block them without issue), I think it's safer to say that Marisa was just holding back rather than the stars being weakened by some outside force. That would also line up with Marisa being the one to suggest a spell card duel in the first place, and explain that they de-emphasize raw power in favor of style.
Second question, minus Reimu (even if she did sort of do a handicap summoning a god and plaguing Yorihime's sword with death essence), Remilia looks like she did the best— at least I think so when I saw what looked like Yorihime taking actual damage against her. Shouldn't that be noted somewhere in Remilia's profile?
Reimu and Yorihime never fought directly, their fight was almost entirely a measure of their summoning prowess. Remilia only did the best because she was the only one to
lead with raw, unrestrained power; Yorihime's strength lies in having
40 million techniques, which gives her a hard counter to any esoteric abilities one might possess. She does not, however, have a counter to throwing hands with someone physically stronger than her. Yorihime only wins by playing into Remilia's narcissism and
convincing her to hold back by using a spell card, which gives Yori the opportunity to summon Amaterasu and blast her with the power of the sun (which is obviously a good win condition against a vampire). Notably, Sakuya is also shown to be
physically stronger than Yorihime as well, but she doesn't fall back on CQC like Remi does. Reimu even goes so far as to note that Yorihime's victory
has nothing to do with power.
It's like comparing a Swiss army knife to a claymore, basically. If you're comparing raw power, then of course the claymore wins. Everything else, though? The Swiss army knife sweeps.
So to answer your question, yes, Remilia should upscale from Yorihime lol
Third, people in the lunar capital are that much more nuts than people on Gensokyo, yes? If the bit for Remilia giving Yorihime damage is true, it would be telling for her, yeah?
They aren't. Eirin is pretty much the only character who's worthy of that much hype, because it's made very clear that she is comically superior to everyone around her. I've shown this above, but Remilia and Sakuya should upscale from Yorihime in AP.
Jidiao like Yachie are equal to dragons, which would in turn scale to the other Animal Realm leaders (and Flandre via her fight with Yuuma, and like... 99% of the high tiers by extension because CDS' scaling is a clusterfuck). Okuu is empowered by and
can summon Yatagarasu, but she's still in awe of Marisa's power to the point of
becoming submissive towards her. Sakuyahime considers the power of the Hourai Elixir (which is Kaguya's own power)
far superior to her own, and I shouldn't have to explain that Mokou (+ literally the entire playable cast of Imperishable Night) scales by extension. Kaguya also
directly compares Marisa and Alice to the denizens of the Lunar Capital. Native gods like Suwako
can surpass the highest of gods, which would include
those living in the capital. I might be forgetting a few things, but it's pretty clear that there's good reason to scale Gensokyo denizens to Lunar Capital denizens.
So no, Remilia beating Yorihime isn't a notable feat. It's just a matter of people thinking Yorihime is some uber-powerful god tier when like. That's just demonstrably not true outside of a single very shaky WoG comment (and
a comment that came with a music CD, if you wanna be really f
ucking generous). Even Yukari hyping up the Lunarians is part of Bougetsushou's metanarrative of Yukari and Eirin being locked in the world's pettiest game of 5D chess, where
Yukari just pretends the Lunar Capital "beat" her for a month straight (when in reality, she had already won at this point).
I think whoever made the old scaling chain just straight up did not read SSiB, only saw ZUN's comment about Yorihime being super strong, and called it a day. Hell, if you wanna get
really deep into this rabbit hole, AFiEU even implies that the capital's "superiority" is a farce and they've entered an era of stagnation and gradual decline while Gensokyo is thriving. It is
literally written into the narrative that the Lunar Capital isn't as strong as people think they are! So much of this is easily disproven with even the tiniest bit of context media literacy that it genuinely pisses me off.
Uh, if you couldn't tell, I'm slightly passionate about this topic (<-- Bougetsushou's strongest solider)