 All through the gospel, they're called the twelve apostles. You can't really call them the twelve apostles when there's only eleven. It's hard to send them out two by two when there's not a number. Suppose you could still call them the twelve by twelve disciples if you're the big twelve conference. Because you lose two teams and you're still the big twelve, even though you only have ten. Same with the disciples, though. We've got to be the twelve disciples, which means we need a twelfth.