That red shirt man in the foreground at the base of the steps of TSBD entrance and just left of center handrail, who appears to have his right hand up, may possibly be Billy Lovelady!
I propose this because there is a noticeable absence of a red shirt in the area to the immediate left of white shirt person (Sarah Stanton) with hand upraised to shield her face from sun which is what that white area is in this GIF of Towner film (center of TSBD entrance).
Oswald is still there at the west side wall of TSBD entrance just above and behind Carl Jones , and may be lifting an object that’s probably a bottle just as he is doing in the Hughes film.
In Hughes film, Billy Lovelady was either further up on the steps and next to Sarah Stanton and in shadow so he is not visible in Hughes, OR he has already moved down to the base of the steps.
Is it possible that Lovelady can be up in shadow in the Hughes film, then move down to the base of the steps to be the red shirt man who seems to have his arm raised HIGH and waving at JFK in thus Towner film GIF?
If this man at the base of the steps is not Lovelady and he is not Oswald then there must be 3 Persons with similar red brown shirts!