Let us not forget, the crew were still around 20mins flying time to land at Vy. Even if the emergency lube was working correctly as the AAIB had stated, the main shaft was effectively unsupported and the resulting damage in the gearbox could have caused considerable other problems. The Emergency Lube wasn't designed around this kind of scenario where the gearbox oil was still contained. Looking on the bright side, EC's malfunctioning system may have been a blessing in disguise.
Strange that EC were unavailable for comment this evening...