thcrozier;
Yes, I wondered about that too - lots of movement.
For me anyway, the issue isn't the "early" unlocking as attributed to the PNF "without orders from the PF" but the fact that a mere unlocking resulted in unintended deployment of the feathers.
By another description, it's the thrust reverser deployment in mid-air problem - it just shouldn't happen. However, simplicity of design and weight considerations may play a role in a more elementary mechanical or even electro-mechanical design which required stricter SOP requirements, (lots in that statement to unpack, I know).
I'm sure someone knows but I'm curious as to what Mach No. the feathers were unlocked in the third launch, (the one with the CVR where "unlocked" is heard about 17" after light-off). Probably it's above the required M1.4 but it would be interesting if it weren't...