I have so many thought on this case. There are so many possibilities that its hard to wrap my head around. I still think we could be looking at a serial killer. You hear a lot of talk about the frenzy and rage of these killings, but there are also indications of possibly being very methodical as well. You can have both in one serial killer. Someone who can be careful and methodical, but also lose control at the time the murder is committed. I personally don't think the use of a knife necessarily points to it being personal. It can, but it could also be the MO of a thrill killer or serial killer. MOO
The killer could have entered through the sliding glass door off the kitchen on the second floor and only went to that floor and the 3rd. Not realizing that there were bedrooms on the second floor. Or something could have scared him off before getting to the 1st floor.
The WI-Fi most likely had a password. Most already have one that comes with the router. I have seen a comment from someone that stated that LE has the killers IP address (it would be the Mac Address not the IP address that you would see from the router), but i cannot find where the police ever said this. If the killer was someone they knew and had been there before and given the password. Then the killers phone would automatically connect when in location (unless the killer either didn't have their phone or they turned off the automatic connect capability).
If this was a killing that had been planned ahead of time I would think that the killer (killers?) had watched the house. There is a little woody area across the street that is a great place to see, but not be seen.
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I think this area would be good for seeing the comings and going of the residents of not just the crime scene, but the neighbors as well.
The tree line behind the house would be good for watching the goings on inside the house.
All of this is just MOO