You could factor in that Xana was likely in her room when he arrived at 4:05-4:06. Goes upstairs (which make sense, since DM seems to think he was heading out of the house).
There are two places to park near the house. One is the main parking at the front of the house, where we saw the victims' cars being towed. The other is behind the house, in a shaded/wooded area reached from Queens Rd. I'm still not clear on where his car disappeared from neighbor cams, but I assume it was at the back of the house, which is where you can walk directly into the kitchen through the slider (as seen on the August noise complaint body cam).
LE is seen examining tire tracks and skid marks (similar to those from a sedan with a manual transmission that's peeling out on asphalt). So I think he parked in front and had to move quickly up around the side of the house - give him 30-45 seconds for that.
This is a person in a kind of frenzy (if the timeline is even remotely accurate). Timestamps on various cameras can be off by a couple of minutes, but it sure seems that the gas station operator sees his car heading TOWARD the area at around 3:45 (article approved by WS upthread:
The Eyes of a Killer)
Or he's very competitive with himself.
When I hear that he's talking to himself, telling himself he's okay, I am again reminded of the coping strategies of children. This is not uncommon in a serious, traumatic situation (he's done it to himself though - that's what is so weird). His urge to destroy himself is beyond any theory of "fear of success" or ordinary "self-sabotage." Yesterday, one wise WSer said it reminded them of people who cut themselves in order to feel something (often feeling depersonalization at the same time). He's a human wrecking ball and so far under the radar of so many people, it's chilling.