Just picking up on these points as an example - have you considered that Oswald was part of a conspiracy and had a specific role to play (or so he thought). Imagine if he had no idea that shots were going to be fired from the TSBD or even at that moment. Imagine if he'd been told to wait in a back room, where he would be contacted at a precise time. Then, when he realised that shots had been fired outside and possibly from the TSBD, he was surprised and realised that it could look very bad for him, realising that he could be being set up. Fearing that he could also be wiped out to protect the conspiracy, he headed home to get his gun and tried to get out of town.
Alas, but that is not Hancock and Boylan's scenario in
The Oswald Puzzle. If I were a grunt-level worker in the TSBD, knew I was part of a conspiracy, and had been told to "wait in a back room" until needed, I think I'd be just a bit suspicious as to what the conspiracy was and what my waiting in the back room had to do with it.
If shots were fired and my only role had been to wait in a back room, I think I would've either stayed in the back room or thrown myself at the feet of the nearest cop. I would think leaving the TSBD, boarding a bus, boarding a taxi and going to my room would be just about the most insanely risky thing I could do.
We can invent ad hoc excuses for Oswald all day long if we're determined to make him a patsy, but the totality of circumstances as set forth in my original post points toward the LN explanation.
I really believe Gerry Patrick Hemming (I think) was on to something when he suggested there were indeed Bay of Pigs-related plots in the works but Oswald may have simply jumped the gun (no pun intended) for his own reasons. I think Hancock and Boylan go awry in their insistence on making Oswald an unwitting tool in the other plots.