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TSBD wasn?t secured immediately. Lots of people entered and left the building in the minutes after the shooting. One of them was the news reporter who spoke to LHO moments before he left.
There was plenty of time for other Suspects to leave the building before the police locked it down.
I don't know about 'lots of people' entering and leaving the building in the minutes after the assassination, but there certainly would have been an opportunity for a suspect(s) to escape before the building was secured.
That being said, the suspect(s) would have had to have been in the building sometime before the assassination and not be noticed.
The unknown suspects would have to gain entry, linger while waiting for JFK, and remain unseen during that time in addition to escaping undetected after the event. Possible, but unlikely.
The fact remains that very few of the employees are unaccounted for during the assassination and left the scene of the crime in the minutes afterward.
And of course, of the few people known to have been in the building during the assassination and immediately leave afterwards, only one of them happened to own the rifle used to assassinate JFK.
That would be Saint Patsy.