We'll eventually know the truth because her friends will talk. The timing of the denials and the original statement of Kerry are the key. You don't have to coordinate the truth. It would have been out Friday with everyone involved on the same page. Instead it got to fester over the weekend.
They also had time to manufacture a story and get everyone to sing from the same sheet of music. I think that it would also involve contacting her friends to make sure they are on the same wavelength. It will take a Linda Tripp-type to get the truth out.