Responses
It's been a long time since I read jjk prologue, so I'll have to go back and look at the attack you're talking about, it's likely that he's just mimicking Gojos technique through his own, but it could also be due to the fact that they're related
I'm a relatively new fan, so if this has already been confirmed/denied, don't mind me. But on watching the film again, Yuta's final attack against Geto seems really similar to Hollow Purple; the stance, the colour, destructive power, all very similar. With the knowledge that Yuta's technique is mimicry, and that the only difference in power levels between Gojo and Yuta is that he can run out of cursed energy and Gojo doesn't, was he copying Hollow Purple in JJK 0? I like to think it was (not the least because it's hilarious to think about Yuta taking a bite out of Gojo at some point in his first few months at Jujutsu High)