Ryu cooks this guy.
Let’s start off with the idea that firstly, Ryu
does have the AP advantage. His statement of having the highest CE output was made at
11:28, and Kashimo was already in the CG at this time, since at
12:00 they’re still planning to enter, specifically having Hakari encounter him. Important to note that this Kashimo barely sustains any physical injuries from Hakari, despite not only
his sandpaper CE trait, but from his
immense output. Therefore, in terms of output, we can conclude:
Ryu > Kashimo ~ Hakari.
This doubles in the fact that Ryu can just easily ignore his CE trait, making it useless. This isn’t to mention the massive range advantage Ryu has, being able to launch blasts like
this, ones that
home in on him, etc. Kashimo’s only wincon is Lightning Charge, which is a valid one, but Ryu has his own in his Domain Expansion. 120% Ryu cooks, and Kashimo’s only defense is HWB, which he absolutely needs to keep up with at all times, effectively rendering discharge useless since he can’t punch Ryu.
And yes, you
do need to keep your hands clasped together, the panels where it was up after Reggie’s hands weren’t together clearly isn’t consistent with what Sukuna did, he kept his hands together for 3 chapters straight. Voting Ryu.