Why would the time for him to get there matter? We know he wasn't in any hurry and we know he was wasting time in Moscow 1 hour early before the killings. We're not talking about him going to the shop to buy candy, he was about to do something irreversible that would have changed (and everyone else's around him forever). Better to take all precautions than to have something that can used against you. The point is that the Elantra he was driving was caught on multiple cameras tracking his movements. How many 2011/2013 Elantras do you think there are in the vicinity of Moscow? It wouldn't take long to narrow down all the suspects.It would have been a hour bike ride and a 3 1/2 hour walk. I bet he had canvased the neighborhood for cameras multiple times and whatever he saw (or better yet didnt see) made him feel comfortable. He knew he would have a new front plate soon. His car had no distinct stickers, dents, etc. Other than stealing a car his own personal car was his only/best choice. JMO
Also, maybe he brought the sheath so he could take it out and put it away? I'd imagine that you're not going to put something that large in your pocket as you jump, run, escape, change, whatever. And it ultimately would have been key in him transporting it out of there without cutting anything or himself. JMO
You phone can't ping off towers or be tracked if cellular is off. which typically if airplane mode is on or your phone is completely off.JMO
Some phones keep GPS on but without wifi or tower data they would need physical access to your phone to retrieve that information. JMO
This is why LE only knows where BK was when his phone was turn off and then turned back on. Where I'm going to suspect he slipped up is that he didn't turn off his phone at all. He put it into Airplane mode. Which killed the cellular but left Wifi and Bluetooth on. And they are going to find his phone's MAC address in the house on a bluetooth enabled device and maybe their wifi router. All of our phones do the same thing when we merely walk down the street. Retailers and LE exploit this to track people in public places. JMO
I am not an expert on anything cellular, wifi, or bluetooth. Just for the record.
Remember. Our brains aren't wired like his BKs. We would never even approach someones front door and jiggle the door knob without being invited inside. Never mind enter someones home and murder 4 complete strangers. MOO
Compulsion probably overcame logic and he convinced himself tall of the things you mentioned weren't a big deal. (IMO)
Taking the sheath with him doesn't make any sense. His car was parked right next to the house, it's not like he was going to carry the knife for hours. He had far more chance of cutting himself trying to kill them than carrying the knife and he couldn't exactly do that with the sheath.
Your cell phone can absolutely be tracked turned off unless the battery itself is also off, it's just harder. Snowden has talked about this in depth if you're interested.
We don't know what LE knows. They've only given the bare minimum of information. I'm 100% confident there's a lot more things they haven't revealed yet.
I understand what you're trying to say, but I don't need to be a killer to know the basic things that will limit the chance of getting caught. This was obviously a pre-planned crime and not something done on the fly. Now we don't know why he chose the house, the victim(s), motive, etc, but we do know that he didn't just randomly stumble on that location and decide to just go at it.