(11 Oct 2020, 7:37 pm)streetdeckfan wrote But if they needed 2 less red ones because the X1 dropped by 2, wouldn't there would be spare red ones regardless of the build order and not an extra green one?
They didn't paint any extra - they've just painted them in the wrong order.
The bus that ought to have been green was painted red, and the bus which ought to have been red was painted green. No big deal.