They may have dismantled them and then fled to AK, not knowing how long the bugs were there. This was right when they took off. They'd been talking revenge on LE, what they'd do if caught. I think LE needed the physical evidence, too, and, they needed them separate, but caught all at once.
No calls, no letters, no one in the same holding facility. I think this had to be laid out very well. They also had two children to think of, and people who were near them. What if they decided to pull a shootout and go out as one family?
They bring JM in to see what he knows, the Ws think, hey, we are golden, they think it's JM!! ETA; Or, Oh Crap, they know about the phone calls!! They're already in AK too, which they probably thought would be like going into hiding, only it wasn't. I think that GW4 may not have come back with the others, either, and stayed up there til he had to come down about B's family court hearing around the end of October.