No doubt Officer Baker has mentioned to law enforcement what he saw. And Mr. Truly knows he has a sighting of a man he vouched for as a worker---------a man whom the officer caught walking away from the rear stairway several floors up the building----------to explain away in a manner that is not lethal to himself.
Enter Mr. Oswald......................
Well! Up to this I have explored the scenario where Mr. Truly (and Mr. Shelley) have no foreknowledge of the plot. They have brought the outside contractors in in good faith.
But what if they are
not innocent of involvement? What might that scenario look like?
Let us add into the mix another element: Mr. Oswald is being knowingly set up.
OK. The plan might work as follows:
1. The outside crew is brought in, but an arrangement is made to have them be helped out with the floor-laying by several internal employees
2. The habit of the outside crew of working through the lunch hour protects the internal employees: making it unlikely that any will watch the P. Parade on 11/22 from the sixth floor, and thus be on the hook for involvement--------each will have an alibi
3. The crucial bit: after the assassination, the real reason for assigning internal employees to help out will come into play------------
they can take all the credit for all the floor-laying project, evidence for which will be apparent to the investigators who come on to the sixth floor. I.e. the outside crew can be disappeared from history
4. A man resembling Mr. Oswald is given the job of firing from the SN window
5. But Mr. Oswald's movements on 11/22 cannot be controlled, so it's always going to be touch and go whether he stays in the building for the P. Parade or goes outside to watch it
6. If it turns out he stayed inside, then the frame-up of him is 100% successful: he has no alibi
7. If it turns out he went outside, then he can at least be implicated as an accomplice (via the rifle)
8. He is not, on either outcome, being set up as a lone wolf assassin but as a member of a conspiracy. The men on the sixth floor do not keep themselves carefully hidden. They are not anxious to hide the fact that this was a conspiracy
9. But how does Mr. Truly explain away the presence of non-employees on the sixth floor at the critical time? He doesn't. He simply offers the heart-broken explanation that Mr. Oswald (who seemed such a nice boy and such a reliable worker) must have slipped several men up there after the internal flooring crew broke for lunch. It was all the commie rat's fault. Mr. Truly's only sin was to give a young man in need of work a job.
So that---------on the present scenario---------might have been the basic plan.
However! Officer Baker's dash into the building forces Mr. Truly's hand prematurely. After the encounter with the man caught walking away from the rear stairway several floors up, he must commit to identifying this man: a worker in the building, but which one? Remember, he cannot reveal the existence of the outside flooring crew.
Nor however can he in hindsight declare he was a stranger in the building--------he himself vouched for the man as a worker he recognised!
Erroneously thinking--------on the basis of his and the officer's sighting of Mr. Oswald in the small storage room on the first floor just after the shooting---------that Mr. Oswald did NOT go outside to watch the P. Parade after all, he feeds Mr. Oswald's name to the cops:
he was the man we encountered by the stairway.
But (for reasons outlined a few posts back) this causes complications. Mr. Oswald, it turns out, was in the doorway at the time of the motorcade, and there is no guarantee that proof of that will not yet emerge into the public domain (before authorities have had a chance to monkey with it, as they must do with the Wiegman & Altgens images).
Result: the rear stairway encounter is relocated to the second-floor lunchroom, an ambiguous, hedge-betting location that Mr. Oswald could conceivably have reached from EITHER the sixth floor OR from the front entrance.