I guess the QC units were given (sold) away to friends and family? Theoretically if you have 10 units that passed QC, these could have been allocated as units for replacement in case damage is found....Although this only applies to Stealth as Dark and steel are not being QCed.... Having said this, surely there was an initial intention to QC Dark/Steel and so there should be 10 units extra as a minimum no? Unless of course not QCing them was always the plan (which would be news for me). So I'm not sure I completely understand how there can be no excess good units if QC units were going to be a thing from the beginning.