In 2010 there was a kitchen fire in dad's house (per MSM) which, iirc, did significant damage not just to the kitchen but the home. I remember that article didn't explicitly say if that was the house he currently resides in (and was therefore repaired) or if it was another house and he had to move into a new home. It doesn't matter and there's no need to sleuth property records (since we can't) since this is just an idea...
I'm thinking about who could've been in and out of the home in rebuilding the damage. That could've been a hefty project. Did he have people who were familiar with the house? Was there work being done recently or not so recently?
Seperate from that kitchen fire, were there handymen who did work on dad's house or on his property? If dad was out of work maybe he needed people to maintain his yard. Perhaps one of these workers only comes around every couple of months or less frequently but dad had casual conversations about Dylan's visits, saw pictures of Dylan and stopped by. We don't know what his other errands were, but we do know that he had 2 pickups towed... so maybe he picks up lumber or equipment from a shop and someone knew he'd be out doing those errands that Monday morning.
We talk a good deal about how "in the middle of nowhere" he lives, so I'm thinking Who might be out there? Are there professions, either private or for the town/state who would work on or in lakes, rivers, bodies or water? I don't know what specifically but testing for bacteria, something like that? Loggers? (I'm more of an urban girl so this is not up my wheelhouse).
I've spent alot of time looking at the maps of dad's neighborhood and Vallecito lake and the general area and I guess my thinking needs to change from "someone random would stick out" to "someone who belongs there wouldn't stick out". So who might belong there? Who could potentially be driving down that "one way in, one way out" road and not raise alarms?
Just more thoughts.
