First of all, no prosecutor would go to trial with the evidence they have against Sonny. Sonny owns at least 2 grey shirts, because grey & black is all Sonny wears. That shirt could've gotten Claudia's blood on it at another time. There's no proof that was the shirt he wore that night. All the hair proves is that he was in the cabin. With the story he's telling, he admits to being there.
But, even before that...all we keep hearing is that Sonny is supposed to be the biggest, most powerful mobster on the east coast. If that's true, the FBI would've taken over his case early in the investigation & they would've had a real CSI team working on the evidence. Forensics examiners would've looked at her wound & been able to tell the force with which she was hit & would know Sonny wasn't the one who hit her. Michael's not the same height or weight as Sonny so he wouldn't hit with the same force as Sonny. It's also interesting that in that piece of fabric that managed not to get burned that only Sonny & Claudia's DNA was on there considering that Michael was the one who transferred that blood onto Sonny's shirt. Amazingly his DNA burned up, but theirs didn't? It doesn't work that way. The testing would've shown 3 sets of DNA, not just Sonny & Claudia.
Then, there's the biggest joke. The jury is comprised of at least 3 people with some personal connection to the defendant. In a federal murder case, that would never happen because neither the prosecutor or the defense attorney would allow it. Coleman is a friend of Sonny's & didn't even pretend otherwise. Lisa admitted to having dinner with him & Alice works for people who have a negative personal connection with Sonny. Also, when a jury is sequestered in a murder trial, they do not go home, even if they live in the same town as the trial. They go to a hotel & are monitored by someone from the court to ensure they don't see news broadcasts or read newspaper articles about the defendant or the trial. Oh & an emergency room physician would probably be excused because of the nature of her job, which means Lisa wouldn't be on the jury. But, even so. She wouldn't be crashing Patrick's romantic surprise for Robin because she'd be sequestered.
As for the supposedly scary smart prosecutor's eagerness to put a brain damaged teenager with anger & impulse control issues on the stand as her star witness? There's no way she'd want him on that witness stand because she'd have no way of knowing what he'd say or how compelling he'd be as her witness. It's also unlikely the court would allow it because of his instability. She also wouldn't waste an hour of the court's time badgering her own witness about a gunshot wound he recieved & already explained in the preliminary hearing, as a self-inflicted accident.
GH has a history of being lousy with trials anyway, but so far this one is the most twisted interpretation of police & legal procedure yet. Just for the shoddiness alone, I hope Sonny's acquitted.
As for the eventual appearance of Michael, Diane should work out a deal with Claire & outsmart her by having her guarantee in writing that Michael cannot be prosecuted for his involvement in Claudia's death & then have Michael return to town & tell the truth about the night Claudia died. His conscience will be cleared without fear of punishment & as a bonus, Claire will look like the twit she is.