Not sure about not being the most sought after. From what I can see there's a few there that are high profile out of the list of 6.....
The fact that there are only 5 (or 6?) and they are not the most sought after discs, proves IMO that AACS 2.0 isn't "cracked", and whatever method is being used doesn't work on every disc, nothing to do with the group having limited access to a UHD BD library.
La LA Land
Passengers
The Huntsman: Winters War
Inferno
Patriots day
The Smurfs 2