The answers to your "question(s)?" are simple. It appears to me that the lady to claimed to see others on "one of the upper floors" saw Norman, Jarman, and Williams on the fifth floor, not the sixth floor.
Well, lots of things 'appear' to you, Mr. Collins, but they are little more than products of wishful thinking.
Mr. Norman himself states he and Messrs. Williams & Jarman avoided the sixth floor because they knew it would be noisy, due to ongoing flooring work. This noise, he further states, did not abate until the time of the motorcade. Mrs. Henderson's observation of men appearing to be at work tallies with this perfectly.
Mr. Norman's information about men (non-employees) staying up on six beyond the employees' usual lunch hour also means we can stop pretending that Mr. Arnold Rowland's bald, plaid-shirt-wearing 'elderly Negro' was the 18-year-old Bonnie Ray Williams: he was a member of the outside floor crew.
And Mr. Rowland's simultaneous sighting of a man over on the west end (which was where the flooring work was being done) now makes new sense: that man too was a member of the outside floor crew.
And Norman was likely referring to the workers from the other warehouse occupied by the TSBD.
Likely? Lol.
Both of the men with Mr. Norman (Messrs. Jarman & Williams) were part of the internal manual crew helping out with the flooring project. Like
all the other members of that internal crew, they had
broken for lunch---together. It is beyond ridiculous to suggest that Messrs. Jarman & Williams would have decided in advance to avoid six because they expected Messrs. Arce, Lovelady, Shelley & Givens to continue working up there through the lunch break, or would have believed that the continuing noise from six was being made by them.
Mr. Norman had worked at the Depository since 1961. No way would he confuse Messrs. Arce, Lovelady, Givens, Williams and Jarman with "outside contractors". If they had been Depository men brought over from the warehouse, he would have known so and said so. He expressly draws a distinction between the outside contractors and those Depository employees who helped out with the moving of boxes, etc. Indeed, he on occasion had himself helped out (pre-11/22) when order-filling demand was slow.
He met this outside crew. You think he just
hallucinated the leader of the outside contractor team whom he describes as "rugged-looking", 6'2"-6'3", 210-220 pounds? Does that sound like Mr Bill Shelley to you? And you think Mr. Norman didn't know Mr. Shelley's name?
It really is this simple. The WC asked every single one of the employees in the Elm Street building if they saw any strangers in that building that day. All of them said no. How could that possibly be (if an outside work crew had been there)?
The outside work crew weren't strangers-------they were familiar faces. That's the point, and it leaves you and your Warren Gullible pals bereft of one of your favorite talking points