That certainly seems like a plausible hypothesis. It is a mystery why he’d bother to bring **so many** weapons to the hotel, especially since each time he’s transporting gives some chance (even if very slight) of being hassled or found out. I can understand he wanted some extra weapons on hand, but 18-19 as has been reported?? That seems rather bizarre under any scenario except the one you outline. (well it would still be bizarre, but at least you offer an explanation!)
Yeah, the 18 - 19 weapons thing is bizarre. That was the about the only angle I could come up with to explain it. The other would be that he was expecting to have “friends” join him in doing the shooting and those weapons were for them. Of course he might just be doing things that make no sense because he’s nuts. That would be the most likely answer according to Occam’s razor but the possibility of his having leftist political leanings cracks open the door to other explanations, maybe.