In "Classroom of the Elite", why didn't the trial about the Sudou assault incident closely resemble a real one (BEWARE SPOILERS)?

I’m not criticizing the series, I’m sure there has to be more suspense, and it’s more fun this way, it’s just that I love legal thrillers, and whenever I find a trial in fiction I tend to get excited.
Anyway, if you’re wondering what I find unbelievable, it’s that class 1-D didn’t find a way to show that the photo made by Sakura could have shown Ishizaki and the others attacking Sudo. Even if the fight had already ended, maybe there was a way to make the evidence look more believable. Sakura didn’t come forward, that’s true, but if she testified that she wanted to keep her idol identity a secret, she could’ve been more believable. I simply can’t say that being from class 1-D automatically excludes you from testifying.
What I wanted to say is, if the “trial” borrowed some real life strategies from actual ones, maybe the situation would’ve been turned in Sudou’s favor.