There were a lot more than three participants. We'll be hearing from other people at the party, assuming a party ever happened.
Kavanaugh claimed today that the incident never occurred, and that until the name was released, he didn't know who it was. If the "he might think" above was his version of events, he could have still instantly recognized the identity of the woman even before the name was released, assuming he didn't make a habit of such incredibly aggressive sexual behavior.
We're already seeing adolescent friends and acquaintances start appearing and talking. There will be testimony. There will be questions. Either her story will completely unravel, or his will, or both. At this point, the real question is not his behavior as a 17 year old, but his behavior last week. Through his denials, he is accusing the woman of slander, and he is doing it today, not in his adolescence. If it comes out that he is lying, he shouldn't be confirmed. If the story is uncorroborated with any other witnesses or other evidence, it shouldn't stand in the way.
Stay tuned for a week of sex, lies, and we can only hope no videotape.