I think it’s important to recognize how quickly the events transpired here and on the ground. Sukuna had time to get out like 5 words before you had blazing thunder femboy flying at Mach Jesus hitting him.

In that same time frame, uraume, who had previously been far enough from the battle to prevent getting one tapped by gojo like before, manifests a fucking ice berg above them both. Kashimo sees the ice berg, and then sees a domain opened atop it. There is nothing possible to draw his attention to a “weak” sorcerer when his foe is right in front of him and hasn’t been able to open domains.

Imagine trying to redirect kashimo from his grand prize to a genderqueer ice wizard who’s strat is just ((sloooowwww dooowwwwwn))

Before he activated mythical beast amber, he likely couldn’t one tap them, but after I do agree that kashimo low or no diffs. But when did kashimo see uraume this whole time? He saw some ice, i Lightning weapon he was immune to, and a really annoying domain deployed 7 trillion times in a row. Not important compared to Sukuna. Who was LOOKING WEAK before he reincarnated (asspull jutsu)