Meh, you can heap a hundred accusations on top of one another, and they will never magically become evidence.
What are you talking about? The most common form of evidence introduced in every trial is first hand testimony. And a lot of women are willing to offer first hand testimony that Cosby raped them. Granted, a jury could claim they were not persuaded, but that testimony was certainly evidence. And when there are dozens of witnesses offering testimony to a consistently common pattern of behavior, it becomes pretty powerful evidence.
If it was one of US lowly Serfs on Trial instead of a Celebrity, those Accusations would magically become Evidence.