Legitimate question because I just don't know much about police or court procedure:There are only 10 days until KAK's next pretrial conference, then a final conference in Dec, before the jury trial in January. I would be surprised if a plea agreement isn't reached in the next 2 months, but sometimes the defendant holds out until jury selection begins. If KAK chances going to a jury trial, there will no mention of the Delphi murders.
If some, as of yet undisclosed, evidence involves him in the murders, perhaps the state will ask for a continuance of his current trial schedule. If the state continues the trial, that does not make it a fact that there is a murder charge in the works.
The process of filing a murder charge and having it brought to trial is lengthy, it cannot suddenly be just tacked onto a different case in a different jurisdiction. The murder wasn't even in the same county as the KAK's other (non-federal) charges.
If LE did have the evidence and were ready to charge KAK with something related to Delphi, and since he's already incarcerated and off the streets, might they wait to charge him until after the CSAM trial, so as not to influence a jury?