Anyone who looks at the Altgens 6 blow-up can see that the west wall of the portal blocks Prayer Man's line of sight of the limousine...What you are saying goes against what the photography you called for clearly shows...I also believe that the best digital tech enhancements of the Hughes Film will show Stanton right up behind Lovelady in the Prayer Man spot he put her in his statement...
This pic is from five years ago when I visited Dealey Plaza. Not the best vantage point to watch the parade.