Imagine----------------for example-----------------this light-brown-jacket-wearing man was the actual man described in Officer Baker's affidavit:
He looks rather like Mr. Oswald. Might Mr. Truly get away with a switcheroo?
Now!
If (
arguendo) the following (columns 4 & 5) from Kent Biffle (Dallas Morning News) reflects a real event:
: then we can supplement our posited sequence of events for an innocent Mr. Roy Truly:
----------At first, he doesn't think the shots even came from his building
----------But he runs in and offers to show the policeman up the building
----------Before they take to the stairs, they see Mr. Lee Harvey Oswald in a small storage room: Mr. Truly vouches for him as a worker----------Several floors up, the officer catches a man walking away from the rear stairway
----------Mr. Truly recognizes the man as one of the outside crew that has been working on the floors upstairs, and tells the officer that he's okay, he works here
----------Later on, Mr. Truly puts the pieces together: that outside carpentry crew were not what they seemed, and that man by the rear stairway was making an escape
Mr. Truly soon realises he has to explain away the man Officer Baker caught on the stairs = the man he (Mr. Truly) vouched for (truthfully) as someone who worked there. Otherwise he could find himself in very deep trouble, as the man who brought that crew in in the first place.
He remembers the encounter with Mr. Oswald on the first floor, and this gives him an idea: pretend it was
Oswald they ran into by the rear stairway several floors up. That gives them an
employee to focus on rather than a member of the outside crew.
Why Mr. Oswald? Because he looks rather like the escaping man; and (crucially) he appears to have been inside the building at the time of the shooting. So the switcheroo just might stick.
Desperate times, desperate measures.
It is only once Mr. Truly has worked out this solution, no doubt in consultation with Mr. Shelley, that he goes to Captain Fritz with his 'I've an employee missing' schtick...................