Dragon Quest?or Dragon Ball Xenoverse?
They haven't. The only reason the gap isn't 7.4m at the moment even though the PS4 sold over 200k more than the XB1, is because of 'adjustments'. I think the actual figure is around 7.4m - 7.5m at the moment, but I'm still confident the 9m is possible even without the 'possible' undertracked numbers being added.
The PS5 Exists.