Well according to the first page of Will Fritz WC testimony, Fritz claims Oswald said he “was eating lunch with “some of the employees” at the time of shooting.
So the initial scribbles Fritz made that vaguely place Oswald in the 1st floor lunchroom (= the Domino room) Fritz is apparently giving himself a lot of leeway to later edit the scenario to fit whatever timeline they construct for Oswald to place Oswald on the 6th floor at time of shooting.
This is why,imo that Fritz would have bothered to write any scribbles at all about a “1st floor lunchroom” and vaguely reference 2 negro employees , BECAUSE Fritz fully intended to negate analibi for Oswald “seeing” the 2negroes returning to Oswald eating lunch” with them , which Fritz could then use to portray Oswald as having lied via Jarman and Norman denying they saw Oswald in the Domino room while eating their lunch.
Also this covers the possibility Norman or Jarman Might verify having lunch with Oswald because that was would place Oswald in the Domino room only at the time between 12:00 and 12:15 thus NOT be an alibi.