Lets do the math: how many women ever existed? How many years did they were fertile? Then we know the number of ovum/eggs and so: the max number of humans that could have ever been. Right?
He's more likely referring to every possible human, which for instance would include every possible other sperm that could have fertilized your egg, in addition to all the opportunities to be pregnant that weren't taken. The numbers get so absurdly large so fast that it's inconceivable.
>He's more likely referring to every possible human, which for instance would include every possible other sperm that could have fertilized your egg
The one that fertilised it is the only one that could have fertilised it. Perhaps if you're into realist versions Copenhagen interpretation then you can argue that in a largely parallel universe that another sperm may have suited the conditions ...