Would be interesting to see some stats on engines that have failed to restart after the mixture was used in an EFATO drill - with the engine to being returned to zero trust immediately after the 15-20 secs to complete or stuff up the drill, not left shut down with or without the prop feathered.
Seems to me that when you hear or read about an EFATO drill that has gone bad there is likely to me more to it than just using the mixture to briefly shut down thrust from the engine.
Dr 