Kleinschmidt,
Where is a person more likely to be noticed -- standing on the landing of the crowded entranceway steps of his or her workplace shortly before, during, and after the president passes by, or sticking his rifle out of a partially open sixth flloor window of said building for about ten seconds while hundreds of people down below are watching the president pass by?
-- MWT 
Are you saying Oswald was in the entrance with a rifle? Come on, these people were not paying attention to what was going on. Reminds of the LNer's btw Martin should become an LN member
The way you make it sound, is that if a rifle was fired from above them, they would write down every person around them like inventory and they say " did you hear what I heard"? Hear what, I'm trying to remember who is around"