Dave is just your average everyman. He does the 9-5 thing five days a week and takes out the trash when voluntold. Dave plays with the kids and watches chickflicks with the wife just cos he is that kind of guy. It doesn't make him a genius --he is just a people pleaser.
Dave has never sought out to a hero or thought of any brilliant time saving or money making discovery and he likes it that way. He flies under the radar and some might think of him as, what's the word? BORING! That's okay; it's just the way he rolls.
So when the zombie apocolypse was announced he didn't run and hide --he simpple out of the blue thought of the obvious solution. Lure the dead heads to a rock quarry and hurl large stones at the living dead and cause traumatic brain damage. it worked in his city so it was tried world wide and voila --zombie no more. People were shocked that Joe average would even come up with a scheme like this. He was hailed a hero and was given the key to the city and named king for a day all because he thought to use construction equipment in a neat way.
How to dispose of the dead and rotting was thought of by neighbor and best friend who worked in a nuclear waste management facility. Bury them with all the used uranium by-product. Ta-da another instant hero named Homer Simpson.