“I’m assuming the girl has been medically examined and there was enough to charge Hayden.”
Unless there was a medical exam done within 48 hours of the last assault, AND there was biological matter to collect, a medical exam proves very little. That’s the real science of forensic medical exams in cases of child sexual abuse. Perhaps the guy signed his name with indelible ink on the “inside” attesting “I was here!” (highly unlikely and still would not prove sexual assault)
A broken, torn, ragged, etc hymen can happen in many ways, and is not limited to penile penetration. Also, many offenders use oral sex instead of penile penetration because it leaves less evidence. Less evidence, but does not diminish the impact on the victim in any way. Digital (e.g., finger) penetration is also common and does not leave collectible evidence.
Just one of the many reasons it is so very difficult to prove the sexual assault of a child.
In this case he was arrested for vaginal rape.