The decks had to be cleared regarding the five cases for which there already was evidence. Must be quite strenuous to get things organised for five cases.The thing is that in the timespan of five years this particular case haven't got any closer to getting to the court of law.
Not to be forgotten is the time delaying legal argument concerning jurisdiction.
Nothing could be done until that was settled and it took appx two years to do that.
There was also the small matter of the fact that the BKA in co-operation with Portuguese and English investigators were - and probably still are - collecting, evaluating and collating evidence in MM's case.
They obviously had no intention of releasing any information about CB in 2019 until someone did it for them.
So if there is blame to be allotted to anyone for five years publicity for CB, look no further than that individual.
Left to their own devices had that leak not occurred investigators would still be investigating and we still would not have heard about CB until it suited police to tell us.
My opinion