He has already said he did. Surely the Covent point is what the workers thought. Agree?
Your question to me was WHY did Frazier ask if they could break early for lunch.
So what the heck do you mean by: “He has already said he did.”??
My opinion is that LHO was hidden from view in the sniper’s nest. He could have sat in there silently. And even if someone else was on the sixth floor at the time of the shooting , they would have been unlikely to know that he was there until he began shooting. Then it would have been too late to stop him before he got his shots off.
So no, I don’t see any importance whatsoever in what time the workers thought that the motorcade was passing by.