If I remember correctly, the "Civil Cases" had all been through a trial in a Criminal Court but were not proved beyond reasonable. But neither had the accused been found "Not Guilty". Instead, the jurors felt that the prosecution case had "not proven" guilt.
The "not proven" bit may have referred to a number of things - questions about forensic evidence, or failures to disclose evidence, or the way the police handled this, that or the other . ie Don't assume that jurors doubted the witness.
In those rare and exceptional circumstances (that can only happen in Scotland), a civil case was very likely to succeed.
I wouldn't consider the cases to be a precedent for suing rapists in the civil courts.