No, I think what happened is that Nifong was surprised there was not a match with any lax players and that it was someone else's semen in her. He, or the cops or investigators, then asked her whose it could be and she gave them three names - her BF and the two drivers. They all gave samples and a match was made.
If the 46 players submitted to DNA testing do they have a legal right to know that not only were they exonerated, there was someone else involved?
I guess this is a legal question. The defense was surely surprised to know that the semen existed since I remember Cheshire claiming the AV hadn't had sex with anyone when the first DNA results came out.