Yes, reading through these new CM articles, I've noticed a few little things that don't quite correspond with previous reports so it's hard to know which are correct. As you say, they report it as being a Facebook conversation whereas most of the other reports on this exchange said it was on Skype. In one of the other reports it mentions that a range of messages were found on both platforms though, so I expect this is just one of those exchanges and there's been a mix up in the reporting as to which platform it appeared on.
There's a few other things too, one of the CM reports that one of the videos MS and HB found was of the DM rape and that it was even used to convict CB for the crime. I'm pretty sure that's untrue. They also seem to indicate the police later identified one of the victims as a 15 year old girl. But surely if that was true, he would have stood trial if they know who the person was?
One thing that I did find interesting relates to that online exchange with the other paedophile. In the transcript shown on CM there are three ellipsis ... shown in amongst the exchange indicating there are parts of the conversation that have been redacted. But there is an indication of what they discussed and I do wonder if the police have chosen to redact it because it points to an area where they may have found evidence.
The first ellipsis appears after the friend says he doesn't have any new videos and CB says "Ok. Anyway sending films this way is dangerous". He is obviously referring to the act of sharing paedophilia content over the internet.
The second ellipsis appears just before CB says, (according to the CM transcript): Then [before they meet] I will record a lot of films. Which is then followed by the third ellipsis.
What CM then indicates in the report (without showing the actual exchange) is that CB and the friend were discussing meeting up in three months time, and that they live in distant cities. And that CB was promising to have new videos to show him at this meeting.
We've known about this Skype exchange pretty much from the start but I don't recall seeing that detail before and it does make me wonder why it was not made public. It indicates that CB was very conscious about putting content online but was sharing cotent in person, probably on hard drives, with other paedophiles. If police have been able to track down some of these other people, it is possible they may have uncovered content that CB has given to them. CB may be totally oblivious to this too, thinking his original copies are well hidden or even destroyed.
I also find it odd that the UK tabloids are not reporting on these 'new' findings given how many non-stories they've reported over the last 12 months. The only report I've seen was from the Daily Star where they spoke about CB talking about liking danger situations and killing a person faster than an animal. But what is strange is there were other details in those CM articles, far more shocking, which they have chosen not to print.
I do wonder if some of the stuff CM are reporting is the result of PJ leaks and not something the BKA wanted in the public domain and hence why the UK tabloids have not repeated it. JMO.