Many of us locally know Dave and have seem him plenty of times. Very few people are able to see auras though.
Dave doesn't have one.
..and what is the reason for no aura... drum roll please
He is not human.
He is not even cyborg. He is a fully self-aware, automated, and self-teaching robot. His model number is the AI-1, the first of his design. The main reason no one knows this is because his uplink is wireless. His mainframe is on a T1 line that goes to a super high bandwidth transmitter. He runs a combo of Linux and Apple. The dual OS is why he is so organized, especially since there is absolutely no Microsoft involved anywhere in his system.
He is a brilliantly deceiving design too because they incorporated a spattering of human quirks to throw off anyone who even begins to suspect.
The true test is if he shows-up in Pflugerville. I know he won't meet us there because his mireless connection cannot transmit or receive that far. Without his mainframe backup he is stranded and can only keep about 5 terabytes of info in his massive, nonvolitle storage, plasma drive.
I know that this has been boringly technical, it was the closest I could get to layman's terms and still explain his system.
Now I have to hide in case he was programmed to eliminate anyone who finds him out.