I doubt that, personally. I think more arrests are going to be made, and, frankly, neither of these guys looks bright enough to have done this alone.
The house in Tacoma, btw, was described as a "virtual motel for transients" in a news report on another thread. In other words, people coming and going all the time, staying briefly, etc.
There's more to this than those 2 guys, although whether we'll ever know about it is another matter.
We still don't know the real motive here do we?? I can't believe it was money from the very start.
Sac