In one post someone said it almost looked like it was a guy with a few drinks in him, the way he was just casually strolling then picking up the latanas flowers, then fumbling with the doorbell cam. I chuckled, but it resonated. He does have some sort of casual detachment or abnormal comfort level given the gravity of what he's doing, and it's not in some cold and calculated pro-criminal way.
Regarding the way the gun was holstered at his crotch. There is a way to conceal carry a sidearm called appendix carry. It involves tucking the gun into your belt, front and center. It gives you quick access for a fast draw but can be awkward.
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What he did was not concealed. It was an awkward low hanging version of this, and it was in a long hanging holster that did not seem to match the gun. This seems to indicate opportunity, cheap, worked practically but it did not match the gun and that further makes me think the gun could have been a replica/airsoft used just for intimidation. If he thought he might actually need to use the gun in commission to a crime why would he have such awkward gloves on that would put him at such a disadvantage if there was a potentially armed homeowner. But if he's coming for an 84 year old lady that lives alone in a dark secluded neighborhood. a replica displayed front and center might be all he needs to threaten her. Remember in the earlier frame he had the gun concealed, and he came up with it hanging front and center, which means to me, he wanted it to be seen, likely for intimidation and coercion to get the homeowner to comply.
So it seems to me to be an awkward, practical albeit fumbling way to display a threat (which again may not be a real firearm, we just don't know) that matches the
obtuse practicality he displayed with the rest of his get-up (mouth light, thick awkward gloves that he thought would hide fingerprints/dna better perhaps, reflective backpack--poor choice strictly practical, will do, etc.)