If CB killed MM why to "expose on the playground" to the kids and aparently with another guy there ? Most likely they were playing, both pedophiles, one daring the other to show his parts, whatever, do i think that a child murderer that killed MM would do that in public ? NO, i don't. He raped the older woman and was very fast, leave she alive, the Irish one took hours, was alive as well, abused the 10 years old but didn't rape her, on public place, same goes for 5 years old daughter of girlfriend, did he had the need to kill, restrain, torture ? NO. If he were to be someone like that and were to do what he did stated on the chat were he then be satisfyed just with ordinary exposing of his genitals ? Most likely not.
What I think is that IF he did kill MM he would have a "type" or a "criminal type" that doesn't match at all with other crimes that aparently he is wanted for.