If it doesn't fit...
Closer to 60 IMO, so in her 70's in 1963, no way it's PM. Full credit to Linda. Brian too since he has ruled out Stanton for me with the image of her he tracked down.
When you actually find whoever PM was it will actually look like him/her and not some old woman nearing retirement why? Because we've already found Frasier a few feet away and that actually looks just like him.
If it doesn't fit...
If it's found that either or even neither, of these two ladies were not on the steps as the motorcade swung by will you be able to carry on? Will it really be that suprising to you?
Have you not come across anyone leaving the position they were camping at to get a better view at the last second?
Use Roy Truly's statements and try and locate him in an image, or another, was the man behind the wall on the knoll still behind the wall as the motorcade aproached his position?
So when Sitzman said they were both still on the bench when she looked there after the shooting.. that's the best evidence?
Where's Cochran when we really need him?
Regarding what Andreaj claims is a short person on the east, I'm not convinced, I don't see anyone there in the moving footage but I should really look again.