I want this cleared up too. If SA leaves work just after 6 am and BJD is leaving her house at 6:20 am, wouldn't it be likely that they crossed paths on the road while both were in transit? Was SA driving BJD's car? Wouldn't SA know that Billie could have seen him drive back to the house (if that's what happened?). I really believe he went right back to the house to rape Hailey. I suppose if Hailey was already dead and in the car he was driving, he could have driven her to the lake right away and he would never have crossed paths with BJD. Also, dogs could have picked up her death scent in that car (as well as in the house).
Do we know if cadaver dogs were used in this case? TIA