Jarman, Arce and Norman were outside until 12:20-12:25
They left and, still outside, went around to the back and took an elevator upstairs
Are you suggesting that persons of interest (or even uninteresting persons) can be eyeballed from a speeding elevator (or even not-all-that-speedy an elevator)?
Duh!.... You're half right ( that's par for a halfwit )
Arce was with Jarman and Norman when they went to the front of the building, but Arce left, and Jarman and Norman decided to go to the 5th floor to watch the approaching parade at about 12:25. J &N walked past the windows of the 1st floor lunchroom and that's when Lee saw them....They weren't on the elevator when Lee saw them.