Remember early on when Zach said the last time he spoke to Wes was about a week prior to AJ's disappearance? Did he ever say what that conversation was about?
IMO, If WH wasn't living at the house, there wouldn't have been a 'passing conversation' while Zach was picking up or dropping off his girls, so I just wondered if Zach expanded at all on that. Not that he needed to by any means.
Edited: As I read back through what I posted, I realized it might come across that I thought Zach/Wes had a friendship of sorts, which is definitely not my take on the situation. I wonder if there was some sort of 'incident' or something going on in the home that one of them felt the need to inform the other about.