I'll comment on the calcs I'm familiar with.
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Here the demon, by moving backward, dodges Tanjiro’s two slashes; in the calc the demon’s movement speed is about 280 m/s slower.
You should consider the fact that Tanjiro was purposedly not chasing the demons as he couldn't get far away from the two civilians he was protecting, Tanjiro actually stated this in the same
scan you shared. Furthermore, in this scene the demon backed using his BDA, which shouldn't be assumed to be equally fast as his physical speed. And on a side note, Tanjiro's movement was 259 m/s faster, not 280 m/s, although absolute differences don't say much about the speed gap.
Once again this is the speed of the demon’s BDA, not his physical speed.
I also saw someone commenting they were ducking using gravity, which makes little sense considering the demons were able to keep about half their bodies floating outside the swamp for extended periods of time without making any movements that would allow them to do so. So, either the water in the swamp was extremely dense, thus allowing the demons to float despite half their body volume being outside of it (which would of course impede them from ducking using gravity alone); or they are using their very clearly magical ability to stay at float without needing to move.
On the other hand, the demon is not 23 times slower than Tanjiro; I don’t know where you got that number from. As I calculated in my blog, Tanjiro’s movement was 291 m/s, while the demon’s hand was moving at 32.3 m/s, that means Tanjiro was only 9 times faster, not 23; I even stated this
in the blog itself.
In
this scene he was saved by Nezuko while he remained practically motionless
This is just not true. The same scan you shared here shows Tanjiro was already winding up a breathing technique even before the demon attacked him, Nezuko simply beat him to it.
In
the profile, they are considered relative
The profiles considering them to be relative doesn't really adds much to the discussion, as the profiles aren't necessarily the absolute truth. Usually, these ratings are decided after discussing whether this character is relative (or not) to this other character, and not the other way around. This argument would be equivalent to arguing that two characters are equal because their profiles say so, on a CRT that precisely aims to change that.
Following the anime, the demon
dodges without any problem
The anime showing a different portrayal of the feats is irrelevant since the manga is the primary canon and as such it takes precedence in these cases. The anime doesn't even fit the requirements to qualify as primary canon.
To summarize this part, you provide 5 main arguments:
- One instance of the swamp demon seemingly matching Tanjiro's speed.
- One instance of the Tanjiro considering the swamp demon to be fast.
- One instance of Tanjiro supposedly not being able to react to an attack coming from behind.
- The profiles labeling them as equal.
- The anime showing a different portrayal of the feat.
The first two come down to the demon using his BDA, which simply can't be assumed to be equally fast to his physical speed unless you can prove otherwise; furthermore, you overlook the fact that Tanjiro was purposedly limiting his movement in order to keep these two civilians safe. The third one is just plainly not true as the same scans you shared show Tanjiro winding up an attack. Regarding the fourth one, the characters' profiles don't hold the absolute truth and are liable to change. The fifth one is pretty self-explanatory and requires no further discussion.
So none of these arguments are actually valid if you're trying to argue the demon's physical speed is relative to that of Tanjiro's.
Here, the katana’s speed is incorrectly extrapolated from the context
Yeah, the speed of the sword used in this calculation is wrong and should be changed. However, Inosuke and Kanao are by no means relative to Doma in terms of speed, Doma was very clearly not taking their fight seriously, he was giggling and laughing the whole time with a wide carefree smile on his face at the same time he praised whatever they did (just as he did with Shinobu and when he met Akaza at the UM gathering); while he simply perception blitzed the two of them when he felt like it (as Epyriel showed). On the other hand, Inosuke and Kanao were evidently struggling (a lot) to keep up against Doma. Doma was so confident in his superiority that when he was done playing around, instead of dealing with Inosuke and Kanao himself, he just decided to abandon the fight and let a single ice doll deal with them. Additionally, Doma himself
stated he was just playing around, which is pretty clear from his attitude throughout the whole battle and from the fact he waited until the last moments to use his strongest techniques.
On top of that, the first scan you shared
here, it's explicitly stated that Kanao was predicting Doma's movements, so she wasn't actually reacting to them.
Do you really believe all this means Kanao and Inosuke were “
presented as equals” to Doma?
In addition, Inosuke and Kanao being relative to Doma would imply they're faster than Akaza and marked Giyu, when they're not even hashira level.
Here, the premise is that Yoriichi was caught off guard by something 363 times slower than him
Yoriichi can be taken by surprise by something that's hundreds of times slower than him even if he sees the movement happening in slow motion, I don't really understand what the issue is here. As long as something unexpected happens, you'll be taken by surprise by this event, even if it happens to be really slow. Being taken by surprise doesn't mean you can't react to this event by the way; both are completely different things.
The thing is Yoriichi simply wasn't expecting Muzan to explode himself at all, he has limited precognition, but he can't see the future. Muzan pulled a bold move no other demon was ever shown, stated or ever implied to have done; so there really is no reason to believe Yoriichi was expecting this to happen, which makes even less sense considering he would have definitely stopped Muzan from getting away if he had known what was coming.
The image does not seem to suggest an omnidirectional explosion (as assumed), but rather an explosion directed toward Yoriichi
I don't really see the explosion being directed towards Yoriichi, if that were the case, you'd expect to see a well-defined stream of flesh bits contained somewhere
within this area, or at the very least they all should be to the right of Muzan's body, which is very clearly not the case.
Also, does it really look like
these bits are moving towards Yoriichi? Because—unless I'm getting something wrong—it just seems like some of them are quite literally moving in the opposite direction.
Based on the fact that Yoriichi considers Muzan’s division to possess incredible strength, it's not impossible to assume that it is beyond Yoriichi’s capabilities
I thought it was rather obvious that, if the flesh bits had a speed relative to that of Yoriichi's, he wouldn't have been able to cut down over 1500 of them. The calculation itself proves he had to be hundreds of times faster to do so, and even if—for whatever reason—we assume he was cutting 10x more bits on each sword swing, he'd still have to be tens of times faster than the bits.
And it also seems like you contradict yourself here
[...] it's not impossible to assume that it is beyond Yoriichi’s capabilities since it caught him off guard
Since a bit earlier you just said that
Being taken by surprise under these conditions [...] is impossible
The scene shows that while Muzan’s head has exploded, the rest of his body is still present
I highly doubt that's the case considering we can't see Muzan's arms despite the fact they were standing out from his clothes just moments before; the remains appear to simply be the clothes he was wearing at that moment. Also, it doesn't seem possible for Muzan's head alone to explode into so many bits that big. And furthermore, the same scene talks about Muzan's
body exploding, there really is no reference to different parts of his body exploding at different times. You need further and stronger evidence to actually claim this is what truly happened.
Using Yoriichi's attack range is bad. It only works if he was exactly where Muzan was
Well, yes… I also
stated this in the blog itself. I modeled the feat assuming Yoriichi and Muzan where in the same spot (while acknowledging that wasn't the case) in order to simplify the calculations, this assumption also yields a lower bound for the feat (which is something I also
stated in the blog), so as of now the feat is actually being underestimated.
This argument ignores the fact that Yoriichi could have simply leaned forward in order to catch the other flesh bits instead of staying in that awkward position, and he's actually shown to be standing upright in the following panels. This also relies on the assumption the author was very carefully making sure all the distances and proportions made perfect sense, even though the drawings of the characters are actually lacking a lot of detail in that scene.
