I'm not sure everyone is listening. The seat appeared to be safe with the pins in the correct places. I too have seen what the pin and seat pan handle looked like when set in this condition - it looked safe, but tragically it wasn't.
I have no reason to doubt that the 7 people that checked the seat (including Sean) carried out their checks diligently and believed the seat to be safe. Quite honestly if I had checked it the list would have just increased to 8. To me (and the SI) the seat has a design flaw that allows the pin to be inserted when not safe. When I flew this seat type (Hawk & Tornado) I had no idea that this was possible.
The SI did not bury this bad news - as soon as this became known to them all users of the seat were alerted with photos and instructions on what to look for. They did not wait for the conclusion of the SI or the Inquest.