I noticed you made a recent contribution on the Breath of the Sun. The edit you made was in violation of the Kimetsu no Yaiba Wikia:Spoiler Policy since the chapter has not yet been released, however I would like for you to inform me on what the official source is to see if its credible or not. If it is then I won't count the edit against you but if it is not then I will have to give you a warning for violating the policy.
i have taken my source out of chapter 192 page 9 (see Mangaplus Shueisha released on 2nd february), where Tanjiro mentions "Dragon Halo Head Dance" as a part of the 12 forms of the Breath. Therefore did i adjust the description due the fact that Yoriichi could not use a technique in conjunction with Nezuko. The other edit of Flash Dance was a minor one, where i changed Waltz into Dance (due the offcial naming). The third edit was based on chapter 192 and information of the chapters before (between the talk Sumiyoshi and Yoiichi). All sources are taken from mangaplus Shueisha.
First Question: Wind or Air exist everywhere. It's not far fetched to say that a strong Pillar like Sanemi can create strong wind gusts by slashsing the air. All strong Demon Slayers are able to use inhuman strength. Tanjiro for example was already after his first training able to split a rock with his training sword.
Second Question: Stylization, there was no truly rain. If you look closely in the manga and anime, you will see that their was a cloudless night. However Tanjiro with his tecnique let it seem like a Sun has been shining alongside some rain. Yet did the Demon stated that it felt like Rain, not that their was truly some rain. You will also realize that their was no sign of water of the technique.
The Breath Style Swordmanships are excellent techniques. The movement of the Breath of Water is so good, that it almost works like real water. File:Unbenannt.png|thumb|Just read this. The same applies to all other Breath Styles. Gotouge (the author) had written an explaination after chapter 151. Just read this.
Hi! That's a very good question. If you notice all breath styles, you'll see that there are not true effects. Just f.e does Tanjiro use Breath of Water right? However the water is drawn in a traditional japanese artstyle, which look different than real water in the anime/manga. You will also notice that there are always no true water, after a technique. No wet or splashes. Same goes to the other. Breath of Flames for example does not incinerate objects, but the Nichirn blade does in contact with Demon cells to a certain extent (see Rengoku vs Akaza). About Gotouge (the author) i remember she did a Q&A. However i do not know if it were a Twitter Statement or Manga written Q&A.