I understand where you are coming from. I know the two who are quoted as observing the bogger hook well off the bang button. One is a passing acquaintance the other I am friendly with and have shot & worked matches with. From what little I know of the one I'm most familiar with I would say he would man up and say finger on the trigger if that's what he saw. As JodyH observed earlier and I can attest to having worked the line at a match you can't stop or observe everything all the time. An RSO may not be at fault if the shooter at the last second inserts his finger in the trigger guard. In my opinion this RSO understands this and would step forward if that were to happen.
That said:
At this point their statements are so burned into their conciseness it would take film at eleven for them to say BPBH got his finger on the bang button.