Kaylee's room seems it would have been well lit with the 'good times' sign. Maddie's room doesn't particularly seem well lit, so it probably would have been dark.
Well, obviously Kaylee's parents would know best what kind of dog Murphy is outside of Jack and Kaylee, but the prosecution in their affidavit did indeed confirm the dog was heard to be barking at the time of the murders from a nearby camera next to the residence. It could also be another dog, but I would find that to be a pretty big coincidence. And correct me if I'm wrong, but didn't Dylan's testimony say that she thought Kaylee was playing with her dog, implying that it was probably barking amid the noise? She might have just assumed it is because Kaylee or Maddie wouldn't raise noise otherwise, but given the situation she probably came to the conclusion it had something to do with the dog because she also heard the dog in the process.
He had 3 opportunities to try DM's door. On the way up the first time, on the way down the second time and on the way out outside the house the third time. You're right, we can't know whether he tried it the first, but we can easily speculate he didn't try it based on the circumstantial evidence. First, because he didn't try it the other two times he passed through the door when Dylan was actually awake. Second, he didn't try it with Xana's door, he also didn't even go there even though technically it's a closer victim than going upstairs. It's unlikely he thought the second floor was unoccupied. I mean, given what we know, he's stalked the house a bunch of time already. He also didn't try going to the first given that if he did, he would have been face to face with Xana much earlier. The only logical conclusion would be that he comes in, goes directly to the third floor to Maddie's room which he has been observing, finds that someone else is there and the crime goes awry and he has to raise a lot of noise to subdue Kaylee who has woken up from him killing Maddie, goes down, stumbles on Xana somewhere around the kitchen or the living room who has also heard the ruckus on the third floor, decides he has to silence her in order to escape, and then he finds Ethan while she runs back to her room trying to escape. Quickly attacks and kills him on the bed given he is the largest threat and then proceeds to finish off Xana before leaving. The question here is whether he sees Dylan and leaves for whatever reason or doesn't notice her due to his tunnel vision and trying to escape as quickly as possible at this point.
