I agree. I have a (very cynical) theory of how this 'alibi' may have come about but won't share my thoughts on that for now. But whatever the case, I expect it to be far from 'solid'.
I do wonder though whether CB and FF may have shot themselves in the foot with this approach. After filming his doc in Portugal throughout last year, MWT then filmed a segment in Braunschweig on September 18th. Most likely, in order to meet with HCW for his interview and share his findings about CB's alibi. The following month then, HCW announces that they do "now" have enough to charge CB in the MM case.
Could be a coincidence of course, but the continual delays to the MWT doc and tight-lipped stance about it all, is quite suspicious. It does feel like there has possibly been some kind of legal issues involved IMO.
Maybe MWT did bring something important to help the BKA's case and didn't even really realise it. Perhaps the BKA can prove the story CB has given is a lie. Will be interesting to see if it tallies with what he said when questioned back in 2013. HCW commented a while back that he didn't want to reveal what they had on CB in case he "tried to change his story"... Now that CB has committed to an official "story", who knows, it could be that HCW's tactics paid off and it leads to CB's undoing.