So was your point that an early shot on Houston would be tantamount to "here I am come and get me" but a later shot on Elm would not.
What I am "trying to get at" is the logic behind your suggestion. Please elaborate.
If there had been a shot from that window while the limo was approaching the TSBD on Houston, what's the likelihood that the sniper would have been spotted up there immediately before, during, or after the shot?
More likely than Brennan's and Euins' spotting Oswald in the act of committing Murder Most Foul down on Elm Street from that window?
I would think so.
-- MWT