Great post! One problem here, I think, is so many are sure MR did it that everything is being made to fit into that theory instead of looked at neutrally.
It's all fantastic to say "oh that's weird, he should be doing this and that" but people are different and react in different ways. It could be that MR is literally in a world of his own as you say, but it could also be his way of dealing with this, particularly as he knows everyone thinks he done it.
I remember the murder of Joanna Yeates here in England. Her landlord was arrested for her murder and everyone was certain he did it (he did look pretty creepy). Once that happened a lot of people didn't consider anyone else and so facts were looked at in context with the landlord instead of as standalone details. It turned out it wasn't the landlord and his life was turned upside down.
My point is I'm worried everyone's eggs are going into the same basket, so to speak, and if it's proven MR did not kill Dylan then a lot of damage has been caused to him.
All my opinion - also to note I'm not saying here that MR didn't do it (I'm on the fence) and that I fully appreciate he is an odd character and his actions are weird but I have a feeling LE know more than they are letting on about him and must have some info which makes them
fairly sure he is not a suspect. Just my :twocents:, feel free to pick me apart