I don't recall ever believing LeeOswald claimed to be out front when the President passed the building! Nor do I believe so now, and I can't imagine that I would ever believe he made such claim, as I have never encountered reliable provable indicative evidence that he did.
Marrion Baker, Roy Truly, and Lee Oswald swore they were in the second floor lunchroom AFTER the P. Parade had passed by ......