Works for me. You have to go where the evidence takes you, not the other way around. I believe this case will be solved. The sole reason the GJ did not return an indictment is because of the DNA found in her underwear. It is a strong, clear, male profile and does not match John or Burke.
They screwed up the crime scene, screwed up the investigation, and didn't really want a messy/ugly, very public trial. Everybody gets to go on about their lives, except, of course, the kid.