Bit random...but what if Jane's family aren't actually dead?
The 'ol tyger tyger group could have orcastrated the murder scene, drugging them or something-telling his wife they have to be under some kind if witness protection thing to stay alive, that way maybe they thought they could either eliminate jane as rj or manipulate him to work on the red John case?
I thought about this because of the episode title 'my blue heaven', and the lyrics about Molly, me n baby, maybe Jane gets reunited with his family? Sophie Miller could have been in on it too - it seems a bit obvious for rj to just leave her recording hanging about with such big clues on it-if he can cut her head off he can check her desk drawers??
It's a bit extravagant a theory but the story has to have some kind of epic ending doesn't it? Also I remember something similar happening in 'Monk' about his wife not really being dead.
Still don't have a clue who red John is though, but I doubt it's someone from the list, it's all too obvious and even the episodes with 'normal' murders happening have far more outlandish conclusions/suspects!
Who knows!!!!