If prayer person is Oswald, then where is Sarah Staunton located in Wiegman and Darnell films?
Sarah would either have to be hidden behind or east of BWF on the front landing. Or Sarah Staunton would have to return into TSBD before Wiegman film records front entrance portal of TSBD.
If Sarah returned into TSBD before Wiegman, then it must be demonstrated that Gloria Cavalry came running up to the TSBD front steps as early as 10 sec post shots, so there is time for BWF to glance at Staunton, simultaneous with hearing Cavalry, and then Sarah leaves "immediately" just before Wiegnman film is recording image of Prayer person.
This is very improbable,however, since when Wiegman film is panning past Mr.Campbell and Mrs Reid* on the curb of Elm, not all 3 shots have been fired yet.
Would Gloria Cavalry have run up to the TSBD entrance steps BEFORE the 3rd shot was fired? Doubtful