Didn't documentary say Christian B was making good money at the time. From drug selling?
Therefore the theory it was originally a burglary & then escalated does not fit.
Then again his rape of a 72 year old woman does have similarities. He must have stalked the womens home & known she was alone. Then climbed over walls.
There is good money to be made from drug dealing and we know Brueckner was a dealer. But he was also a burglar and a criminal who could and would turn his hand to any crime depending on opportunity.
He also planned his crimes. He took his 'rape kit' with him to the villa in close proximity to the McCann apartment and carried items he stole from his victim away with him.
Most chilling are his paedophile offences of which he kept 'trophies' on pen drives.
The BKA have huge collections and they have interviewed Brueckner contacts from the dark web.
Presently I am at the beginning of MWT TV programme where he is talking with an expert who was checking out phone numbers. Namely the numbers which were of interest to police investigators. How much of a co-incidence is it that the present owner of the number has extensive contacts with various internet sex sites some of which appear to be paedophile in nature?
I don't think anyone would be able to convince me that the Germans don't have similarly qualified experts who reached that conclusion way ahead of MWT contact.