I agree. I think it's just as likely KB killed him as it is that JW killed him. At this point JW is being the proactive one, seeking discovery, which means he really wants to know what KB said in her statements to police. Friends and family warned JW repeatedly that KB was bad news and to stay away from her, but he just couldn't. KBs story is full of finger pointing at him - HE beat the baby, HE stuffed the baby in garbage bags and put him in the closet - HE dug the grave and buried the body. I think KB is in major CYA mode and JW is in for a shock when he sees the discovery documents. He's also already demanding a jury trial. KB has not requested discovery or a trial because I think she sincerely thinks there will be no trial - not for her, anyway. I think KB actually believes that her story of JW being the sole culprit is going to get her off with nothing more than accessory after the fact.
But it's already looking like JW is going to fight back, and fight back like hell.