The 'break in' looked more like a fit of rage, the neighbour was really bigging it up, like a scene of carnage, it was basically a few spice jars chucked around and plates in the sink , I wonder if he had some kind of mental breakdown with the stress of the house build opposite, the smoke bombs were quiet odd, what was that meant to achieve? I think he was killed by the rubbish truck, you would get some knocking around inside one of those surely, or he was unlucky enough to come across someone who killed for fun
Spoiler:
I agree. The video footage of him in the car park especially looked like he was having some sort of episode. It reminded me of that case about Elisa lamb, there's footage of her in a lift in a hotel acting really strange like she's scared and is looking round corners and going in and out of the lift and she ends up dead in the water tank in the roof of the hotel. The most common theory with her death also is that she had some sort f a break down, she had Bipolar as well iirc) here's the video (it's kind of creepy)