Flown with the augmenting FO was impressed with his professionalism.
207 is pretty hard for the augmenting crew. You are sent to the bunk at about 3.30pm body clock, roll around for 6 1/2 hours then operate just when you want to go to sleep until about 4am body. The approach to JFK is flown right at the bottom of the circadian cycle. Last time I flew the operating trip, the augmenters tried to stay engaged but woke up when the gear went down. I think that is pretty standard, it’s also why we fly with augmented crews!
How they can be blamed for screwing up when expected to be fatigued is beyond me. It is a very worrying precedent.