The above stabilized frames from Towner put it beyond question that
the movement of Red Shirt Man's body corresponds to the movement of the object he's waving.
But---------------to return to a question posed by Mr. Mason----------------how come we cannot see Red Shirt Man's head?
It seems unlikely that his head is fully shadowed by the western column. Though further cross-referencing with the momentary shadowing of his head in Hughes is needed to rule this out definitively. Certainly half of his body (the western half) appears to be in natural shadow, so might he possibly have his head tilted west during the Towner frames?
Absent that natural explanation, we have the possibility that his head has simply been blacked out by the 'investigators'.
There may, however, be a third possibility, and it's a startling one:
What if we are in fact seeing the back of Red Shirt Man's head? That is to say, what if Red Shirt Man (a.k.a. Mr. Oswald) has turned his back on the motorcade-------------as part of his staged 'protest'?
It is certainly striking that, even when he leans east (viewer's right) to pump the flag at a lower elevation, all we see is red---------no white tshirt, as one would expect given that he has at least several buttons of his shirt open. The only light color we see in that area belongs to the raised left sleeve of the black gentleman in front.
Has Mr. Oswald turned his back on the P. Parade, such that he is now pumping the flag with his right arm?
As well as enhancing the political protest element, it would certainly offer Pres. Kennedy an unmistakable thing to look out for.