Does anyone agree with me that no professional assassin would go up to a window and stand there holding his rifle at the ready , risking being seen before the motorcade has arrived?
Would not a professional probably have a radio himself to know when the limo is about enter Dealey plaza?
Would not a professional probably check out the floor first BEFORE he gets his rifle, so in case there is someone on that floor, at least the professional will not be appearing obviously as a shooter.
So whomever was seen by Arnold Rowland at the SW window, was probably NOT a professional gunman.
A few alternatives:
1. The gunman was Oswald who wasn’t a professional , didn’t have a radio, miscalculated that the limo was arriving at 12:20, prematurely hastily went up to the 6th floor , got his assembled ( earlier morning) rifle , after he had been seen at about 12:12 by Carolyn Arnold in the 2nd floor lunchroom. He then went straight to the SW window anticipating the limo possibly about to enter Dealey plaza. He then became aware of Williams not by LOS but by HEARING the movement of the roller that Williams was sitting on. Oswald then backed away from the SW window and went around to the NE corner of room and maybe even down part way the east aisle towards the SE window where he just waited. He heard and possibly glimpsed BRW getting on the elevator at approximately 12:24. Oswald then in 1 minute (about 80 ft from the SE window) was able to place a box on the window ledge before the Bronson film stared at 12:25. He sat down on the box next to the pipes and was able to hide behind the wall just left of the window so that he was not in LOS of the Hughes camera angle. he MAY however have been in partial LOS of Howard Brennan.
2. Oswald was NOT the designated shooter, but was being fooled to believe he was to display a rifle at the SW window to test security personnel and if they could spot him in only about a 10-15 sec display at the window. After doing this deed and then hiding the MC rifle which he also was fooled to believe was a test, he left the 6th floor, went down to 1st floor and was seen by Carolyn Arnold at 12:25 in the front lobby. He then went out to watch the P. Parade about 12:28, standing somewhere on the front steps.
3. Oswald was in the 2nd floor lunchroom at 12:15 when spotted by Carolyn Arnold, therefore the rifleman at the SW window at 12:15 was some other person, who reacted in the same way as postulated in option 1 above. This person was also probably NOT a professional and may have been some other TSBD employee such as Jack Dougherty with questionable alibi. The MC rifle was pre planted to frame Oswald.
4. Alans new theory: A crew of conspirators secured the 6th floor and did something there which Alan will eventually let us know and will have an explanation for why one of them thought it necessary to display prematurely, a rifle at the SW window at 12:15
