With regard to person in white shirt with arms raised shading their eyes , IMO that person is not likely Sarah Stanton for the following reasons.
1. The forearms appear too skinny , unlike the fatty arms of Sarah
2. The position of “shading eyes” person is not near enough to Pauline Sanders to be considered “beside me” per Sanders statement
3. There is more probable LOS from shading eyes person to the JFK limo after it passed, in contrast to where prayerblob iis located ( blocked by actual side of bldg,
4. The position in the center of the front steps is more probable to have seen Baker running to and up the steps, in contrast to prayerblob position in west corner where LOS to the east half of front steps ( the side Baker went up, thus being seen by Pauline Sanders) , more probable to be blocked by BWF , Joe Molina and Shelly occupying the 4 ft wide landing space just in front of the right side entrance door.