I feel for the RSO/LCO in this situation. How are you supposed to catch this issue without asking a million questions or watching assembly for each rocketeer. Not possible/practical.
I know nothing of the actual events, but one that seems to lead to a logical scenario of small changes leading to the failure would be:
Seasoned flier L1 and L2, many flights. Decided to add to the challenge by adding electronic deployment to the toolbox for the first time. While focusing on the electronics, someone mentions that the electronics are so good now that you don't need to rely on redundant motor deploy, so just leave that out, as it could be another point of failure. Flier sees the logic and misinterprets what that means and leaves the delay out, not just the BP, as they were focusing on the new aspect of the flight with electronics and just took a passing suggestion from a seasoned flier about leaving the motor ejection out at face value, not really thinking about it and understanding what they really meant. I imagine about 0.5 seconds after the go button got pushed, the flier saw the issue in their prep. . .
Again, I hope the rocket is easily repaired and the case cost (assuming total loss there, except for aft closure) isn't a problem.
I hope the Sunday winds were more favorable and glad to hear you got 5 rockets up. I'm betting you used 5 igniters as well. . .I'm hoping to bring my igniter usage vs. flights flown closer to unity next launch. . .
Sandy.