None of them saw or even claimed to see Oswald anywhere at the time the shots were fired, so your point is invalid. And neither Sarah nor her relatives said anything about the second floor. You just made that one up.
Highly dishonest.
Fritz Report: "I asked him what part of the building he was in at the time the President was shot, and he said that he was having his lunch about that time on the first floor."
Bookhout/Hosty Report: "Oswald claimed to be on the first floor when President John F. Kennedy passed this building."
Fritz's testimony:
Mr. BALL. With reference to where he was at the time the President was shot, did he tell you what floor of the building he was on?
Mr. FRITZ. I feel sure that he told me he was on the second floor.
Mr. BALL. Look at 136B.
Mr. FRITZ. All right, sir.
Mr. BALL. The second paragraph down, 136B.
Mr. FRITZ. Yes, sir; second floor; yes, sir. He said he usually worked on the first floor. I asked him what part of the building at the time the President was shot. He said he was having lunch at about this time on the first floor.
Hosty's book, "Assignment: Oswald":
"Where were you when the president went by the book depository?"
"I was eating my lunch in the first floor lunchroom."
So much for your "more credible evidence". 
Mr Iacoletti wrote:
Mr. FRITZ. Yes, sir; second floor; yes, sir. He said he usually worked on the first floor. I asked him what part of the building at the time the President was shot. He said he was having lunch at about this time on the first floor.
Hosty's book, "Assignment: Oswald":
"Where were you when the president went by the book depository?"
"I was eating my lunch in the first floor lunchroom."Congratulations Mr Iacoletti...You're starting to learn the tune.... You're now repeating the tune I taught you a couple of years ago....
I'm sure that you recall that you accused me of lying ( or words to that effect) when I told you that Lee was in the first floor lunchroom at the time JFK passed by the TSBD
Nice to see that you've learned a little bit.....
