Why didn't BRW notice Oswald scouting these different locations? (I'm assuming you're still using this lame explanation to account for Rowland's observation of the man with the rifle around 12:16pm)
BRW would have been looking out the window.
I don't know where you are going with this. Nothing Rowland, Givens, or BRW said does anything to change the fact that Oswald fired the shots that killed JFK from the SE corner window of the TSBD.