It would be very interesting to know what kind of a drinker, and drunk he was. Was he amorous, angry, or happy when drinking? My money's on hostile. I also wonder if he took steroids?
On his FB account, there is a pic of him taking a selfie in a bathroom mirror (from 2014) and one of the comments is "is that the drug bathroom?", which indicates that drug use is not foreign to him.
All that because I was trying to play out a scenario that might make sense. It sure sounds like not too much time passed between the cooking, eating and laughing and the 11pm silence. I can see the following happening:
Is it possible that they ate, both got a little drunk and fell asleep by 11pm? Zuzu probably didn't need much alcohol since she was small and probably got drunk easily. And there was no mention of them having sex, which is actually very surprising, but fits into my scenario if they had drank too much. Anyway, maybe a little bit later Zuzu woke him up and it irritated him, so when the neighbor heard STFU, RF also held a pillow over her face (or something like his arm) at that moment, then fell back asleep. Maybe he then awoke again at 2am, realized she wasn't breathing so shook her to wake her up, and freaked from there.
Maybe in a drunken state he did these really stupid things that resulted in her accidental death. Not making excuses, just trying to figure it out.
Also, somewhere I read that he had called CE twice and snapchatted him once all in a very short timespan around 3:00am. I can't find that link now. But if so, the only times that make sense for CE to tell his friend he couldn't get blamed for anything had to occur at 1:00pm later that day, or 1:00am later that night (which is technically the next day).