Are you willing to share what your evidence is that the big winners do the best during the interview phase? Do you rank all startups that are accepted into YCombinator?

Have later YCombinator classes had a larger percentage of homeruns? If you have more applicants and have gotten better at selecting, this should be the case.

Is it about selecting winners, or weeding out losers? Are there companies that you know will fail? Who would be least likely to succeed as an entrepreneur?