SAS - true, there is no info about the state of the rest of the gearbox, but with that much metal missing from the pinion, and with a gearbox that has proven it can't run for long with no oil in it, it seems likely that there would be significant degredation of the transmission drag. Not certain, just likely.
malabo - just how do you practice fulldown autos with no tail rotor drive in your aircraft? Or do you mean fulldown autos with the examiner planting his feet on the pedals so you can't move them? There is a massive difference! Or do you use a Sim?