That's a fair point. HCW commented they were looking at all similar crimes to see if CB might be a suspect for them.
Also fair points on the whole. Like I said, I'm still not convinced one way or the other, just putting forward some reason why the unplanned scenario makes some sense to me.
Just picking up on some of those points though.
You mentioned people spotted lurking, but these were all in the daytime. If he was monitoring their evening movements, it's a lot harder to go unnoticed. I'm not sure where you could safely observe the apartment/tapas group without standing out.
You asked if she was killed in the apartment, wouldn't it be just as likely be a failed abduction as a failed theft? Well, to my mind no. If he was planning an abduction I would have expected more care to be taken, plus he had a predefined goal to get her out of there alive. That's not to say it couldn't have happened though, so still quite plausible.
Similary, I wouldn't say re-registering on the 4th is just as likely in either scenario. If it was for the purpose of an alibi anyway, knowing he was going to need thay alibi it would have made more sense to do it beforehand.
Regarding MM's bedding, it looked remarkably neat. Perhaps too neat, as if put that way. And I'm not suggesting any scenario where she bled. If he had to kill her in a spontaneous way, it would likely been via strangulation or suffocation. Would be almost impossible to detect that had happened in the bedroom without a body. Even with a half-decent investigation team doing the forensics.
Regarding material evidence and knowledge of the crime, my suspicion is that they are not taking about the same thing but could be wrong. The material evidence apparently relates to knowing MM died. Knowledge of the crime implies CB told someone something. If they were able to tie CB to knowing of MM's death then surely they would have enough to charge. To me, it reads more like they can prove MM is dead but not quite tie CB to that material evidence. They then also have seperate evidence that CB has told some unknown detail of the crime to someone.
I think it's good to debate though. Thank you for some constructive arguments. A number of people think simply saying "it doesnt make sense" is a valid counter-argument.