At the time that the JFK motorcade entered Dealey Plaza, Oswald may have been "in the building"
At the time the JFK motorcade approached towards TSBD, Oswald may have been "in the lobby"of the building"
At the time the JFK limo turned onto Elm st, Oswald may have just opened the front door slightly inwardly, and sliped out to catch a glimpse, and stood at the west side of the entrance landing. Oswald was just an insignifcant newly hired employee that nobody noticed, or cared about, other than perhaps BW.Frazier.
Did Oswald misinterpret what the phrase "at the time" meant?
What about the other opportunities Oswald had to declare "I was out front"? The Midnight Conference. Oswald speaks to his brother. Oswald speaks with Marina. No mention by Oswald, of his "out front with Shelly" or "out front watching the parade".
It is a question of Oswalds state of mind. Was he overconfident? If Oswald is prayer person, then he knew he had an ironclad alibi, but if he were also in a state of mind as the WC theory suggests, of "delusions of grandeur" then it is possible Oswald thought he could take advantage of his "wrongful arrest" to secure fame and monetary settlement. If so, then he miscalculated he had "time" to play this out.