I was thinking along similar lines myself this morning. I reread the 194 page interrogation of KAK and the forensic analysis of his devices. In all those pages there was something important missing. There was no involvement of Tor, a VPN, the dark web, bit torrents or peer to peer networking. KAK was using Instagram, MeetUp and SnapChat and a dropbox on the clear web to openly catfish young girls with no attempt to hide his ISP or cover his tracks. This is not the fingerprint of a member of a sophisticated CSAM ring.
This is the fingerprint of your average catfish who uses a fake profile and pictures of a hot guy/woman to talk intimately with and procure intimate pictures of people who would not give them the time of day in real life. KAK admits he catfished numerous young girls this way and had done so for years.
During the interrogation the investigator continued to hammer KAK with the fact that all the communication from the Anthony Shots account came from KAK's ISP, KAK's devices and KAK's location. There was a detailed conversation about possible friends or family members who may have had access to KAK's devices in the home, but no conversation that the Anthony Shots account had been accessed by anyone from a different ISP or device that was not KAK's.
It is not unusual for individuals arrested for CSAM to muddy the waters with the misdirection that others living in the home or friends who visited could have accessed the devices and committed the crime in the absence of their knowledge. LE led the interrogation in that direction themselves to get a jump on information KAK may try to use in his defense and it worked. KAK told him who lived where and when, who visited where and when, where KAK was and when, and so forth. The interrogation and forensics on the devices showed the presence of no one other than KAK and the young girls he was chatting with.
If KAK recently introduced RA into this equation LE should be mindful to consider everything KAK says as some kind of misdirection for his own gain and nothing he says about RA should be accepted as fact without independent verification.