Nice use of the Bill Clinton card, the conservative equivalent of the liberal's Nazi card, but completely irrelevant here. The "Bottom Line" as you put it is that in a criminal trial for rape under the American "innocent until proven guilty/reasonable doubt" system, if all of the physical evidence can be thrown into doubt, it boils down to a he said-she said case, and that's more than reasonable doubt, especially given other behavior of the alleged victim.
Let's recap:
1)No semen evidence from Kobe, but from others.
2)Slight physical injuries, but since she's apparently had sex with others between incident and examination, they can't be linked to Kobe
3)Odd behavior of victim after alleged incident. You can try to spin it anyway you want. "She was so traumatized by the rape she just wanted to have sex with two other guys before going to the cops" but it still seems odd.
4)Alleged victim's odd behavior before incident, separating Kobe from his bodyguards, then sneaking up to his room
More importantly, sworn testimony on behalf of the witness. Last I heard in a court of law, sworn testimony was still considered evidence.