It's not as if the FBI investigation or any other investigation at this point could possibly show conclusive proof of Ford's allegation - but they certainly may show that Kavanaugh was not truthful in his interviews and the Senate hearing about his behaviour in high school and college. Looking at some of his own earlier speeches and the comments of his classmates, it certainly seems like that is the case. The least you can say is he twisted and misrepresented facts to his advantage like a politician would do, and rather unlike a judge.