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Okay jokes aside you would need to like. explain why the current feats are invalid. We have 4 accepted infinite speed feats, and various speed calcs and statements supporting speeds far in excess of hypersonic (like
this one, or an
offsite calc for Marisa
dodging natural sunlight).
Next, the Sanzu River feat.
Out of the 5 sources provided for this feat, only 1 can give proper evidence of an infinite distance: Komachi's dialogue with Marisa, as most of the rest refer to the Sanzu River having an infinite supply of water - although, since it's a flowing river, this won't necessarily have an effect on its width.
As for Komachi's quote: "
Return! For living humans, the width of the Sanzu River is infinite! I won't let you cross!"
This runs directly counter to Ran's article in BAiJR, which says it is an inverse proportional curve to "the ferryman's fee" for the person, which is stated immediately afterwards to not literally refer to a fee, but a number of factors about the person's history, Still, Ran states that there is an equation to accurately calculate the width of the Sanzu River while taking this "fee" into account (which would, in theory, make it finite).
So, how can this be reconciled with Komachi's statement in PoFV?
Basically, there are 2 possibilities:
1. The "fee"
is 0 for living humans, making the Sanzu river truly infinite. In this scenario, "
I won't let you cross!" is an acknowledgment of Marisa's infinite speed... Which she couldn't have known about,
unless it was a common trait in the verse and she just assumed it applied to her, as this would be her first time meeting Marisa.
2. The "fee"
is not 0 for living humans, and is calculated the same as for deceased. In this scenario, "
For living humans, the width of the Sanzu River is infinite! I won't let you cross!" is referring to Komachi's ability, Distance Manipulation, and the way she chooses to use it, which is to say that Komachi will continue to increase the width of the Sanzu River until either Marisa leaves or Komachi is unable to continue expanding it.
Coincidentally, Komachi in this scenario would indeed either unable to continue expanding it or chooses to stop after her fight with Marisa, as she presumably has to leave in order to either be reprimanded by Eiki or another higher-up due to her slacking off.
There is also more evidence to support this in PoFV, as Komachi attempts to extort a real fee out of Reimu for a luxury cruise across the river, without stating any strange quirks like an infinite distance for living humans, nor does she EVER mention this again.
So, which of these is correct? I believe the second is more likely out of these too, but make your own judgement.
I am, however, confident that this is enough to cast reasonable doubt on the Sanzu River feat being infinite-speed.