DG is Alan L's brother-in-law which makes him a family member through marriage. The accused may see him as a witness to target even if he slept through the crime. I do not think this family is as shocked as people would think that DG is behind these murders. If DG got away with these crimes he may come back later for NO because all NO would have to say is i heard grandpa arguing with him, etc. Maybe not witness protection as much as just protecting NO.
DG may think NO ran away that morning and no one could find him therefore he is no longer a threat. He certainly is not going to say oh i never hurt the kid to LE admitting he was there. He may be wondering himself what happened to NO and if he is out there but he is not going to ask LE questions about it. JMO
OK, DG is only one, and a distant "relative" at that. I would argue that, as Alan L's common-law bil, he was not a relative to NO at all but rather a "relative of a relative".
I find this theory to be beyond doubtful. DG is not some mafia don nor criminal mastermind with a long reach to rub out any and all witnesses. He's a common criminal.
To suggest a 5 year old child would be removed from his family (are you suggesting forever?) and his siblings, and all other relatives and friends but for one or two parents would be told their brother/nephew/grandchild is DEAD, with all the grief surrounding such news, with candlelight vigils, balloon release memorial events - no LE authority would ask it, no parent would agree to it.
Even if NO was alive (and I'm sorry, I'd love for that to be true but it just isn't) he would not be in any sort of danger from one common criminal. There is nothing special about DG. If there was, he wouldn't have a criminal record for all kinds of ordinary crimes.
And if DG gets away with these crimes, he could not be recharged. So if NO was alive and remembered an argument, it would be too late for justice.
Believe what you like, but i personally think this is the kind of story we see on tv and not in real life.
IMHO