IMO, some very significant details have been hit upon by members on here in the last couple of days. For starters, if the MS podcast episode with the journalist is to be taken at face value, then she had LE sources telling her all along that KAK is not the killer but knows who it is, and that more than one user was on the a_shots account. That adds some credence to the 2020 KAK interview transcripts, imo.
Not everything in that interview necessarily had to be true (on KAK or LE's part), but I think the overall picture might be somewhat accurate based on the fact that KAK is in jail on charges of CSAM, BP knows a_shots was communicating with L, and LE has put out the a_shots ask.
We have LE telling KAK they think there was more than one user on a_shots, supported with what the journalist said, and perhaps, just maybe, this explains the two sketches. If, for example, the second sketch is supposed to be of KAK, then maybe that's because he's the known user of a_shots, and until he names the other user(s), his face is the one LE is going to plaster all over H*ll.
And as has been discussed, there's the matter of proving who are the users of a_shots, whether or not any or all users are involved in the murders, and if all those hours, days, months, and years of CSAM use connected to the Peru address are, in fact, connected to the murders, as well. JMO.