I'll answer your two questions with very simple answers. Oswald was not eating his lunch (no witnesses saw him ) but was in the 6th floor of the TSBD from where he shot three rounds from c2766 and killed JFK and wounded JBC.
Two TSBD employees entered the TSBD at the rear door at 12:27.... They were Junior Jarman and Harold Norman. They walked across the first floor and entered the west elevator and rode it to the fifth floor. Lee Oswald told Captain Fritz and FBI agent James Hosty that he watched Jarman and Norman as the traveled to the elevator.
Please explain how Lee could have watched Jarman and Norman as they traveled across the first floor if he was on the sixth floor???
Mr. BALL. Who was standing with you when you were
standing on the sidewalk, on the Elm Street sidewalk?
Mr. NORMAN. I remember it was Danny Arce.
Mr. BALL. And who else?
Mr. NORMAN. I remember seeing
Mr. Truly and Mr. Campbell. They were standing somewhere behind us, not exactly behind us but they were back of us.
Mr. BALL. Anybody else?
Mr. NORMAN. Well, I believe Billy Lovelady, I think. He was sitting on the steps there.
Mr. BALL. He was?
Mr. NORMAN. Yes. That is about all the employees I remember seeing out there. There were more people out there.
Mr. BALL. Did you stay there?
Mr. NORMAN. Well, we stayed there I believe
until we got the news that the motorcade was coming down, let's see, is that Commerce,
no Main, because Commerce-
we went back in the building, James Jarman and I.
A timeline of the Presidential Motorcade taken from Dallas Police Radio logs indicates the Motorcade got to Main about
12.24pm. Jarman estimated the time they left the front of the TSBD to be
12.20-12.25. They walked approximately 200 ft to the west elevator and about 160 ft to the SE corner of the 6th floor. This would take about a minute at 6ft per sec walking speed. The elevator took about 45 seconds to reach the 5th floor. They could have been in position on the fifth floor about 2 minutes after departing the front steps and may have been
in position on the 5th floor around 12.26 or slightly earlier depending on the accuracy of the broadcast.
It was only after this that Williams vacated the snipers nest.