Thank you for your clear answer, Mr von Pein! 
If Mr Oswald did indeed indeed confirm the 2nd floor lunchroom incident, then how do we explain this from Agent Hosty?

Did Mr Oswald tell Captain Fritz he went to the 2nd fl lunchroom to buy a coke, came downstairs to eat his lunch, went out front to watch the parade, then (just after the shooting) went to the 2nd fl lunchroom to buy a coke, came downstairs to eat his lunch, went out front?
I believe that Hosty was a bit confused ( due to his panic caused by Oswald being caught) He had been chewed out and ordered over to the DPD by Hoover less than an hour earlier, and he was trying to clear the FBI of any failure that could have led to the murder of the President. ( He wasn't smart enough and wasn't the agent for the job)

Years later he was still trying to clean up some of the mess he made when he wrote the book "Assignment : Oswald" in 2011....On page 23 of his book Hosty wrote about the interrogation of Lee Oswald that was conducted ( pun) at 3:15 11/22 /63 ...
Quote on...
Where were you when the president went by the depository?"I was eating my lunch in the first floor lunchroom."Were you ever on the second floor around the time the president was shot?"Well Yeah, I went up there to get a bottle of Coca- Cola from the machine for my lunch."But where were you when the president actually passed your building? "On the first floor in the lunchroom"Quote off...
There can be no doubt that Lee Oswald went to the second floor and had a coke in his hand when Baker and Truly encountered him in the second floor lunchroom.
About a week after the coup d e'tat a reporter from the magazine US News and World Report was at the TSBD talking to Roy Truly ....
Truly told the reporter that Lee was in he second floor lunch room calmly DRINKING A COCA - COLA when Baker opened the door to the lunchroom and demanded to know what Oswald was doing there.....
This interview took place before anybody knew that there was a huge problem with the theory that Lee had ran from the SE corner of the sixth floor to the second floor lunchroom after the shooting.