Maybe so, but not in the same amount of time. Sequoia and Kleiner have been around since 1972. 45 years. YC has been around since 2005. The larger a startup gets, the more likely we are to hear of its failure, and the firms you mention are all making much bigger bets. YC comes in earlier and spreads its bets wider. It takes it more than 100 startups per batch. I doubt Sequoia makes 100 investments in a year.