I believe you are missing the point he is trying to make. With parallel debugging a lot of the time will be spent looking through code that has already been che

I believe you are missing the point he is trying to make. With parallel debugging a lot of the time will be spent looking through code that has already been checked (more women can't have a single baby in less than nine months). The only thing that changes is the expected amount of time it will take to find the bug (with more women there is a higher chance of having a baby in nine months). Even if you do have the best debuggers, they can still miss the bug. By throwing more debuggers at the problem, there is a higher chance the bug will be found in a given time frame.