Hi guys,
I'm completely new to this page, I've only watched season 3,4 and 5 episodes once so I may have a few things wrong so please correct me if so :)
I was just thinking that maybe Kenneth is the one who hit Ali but he did this thinking it was Bethany or whoever Jessica's possible other child might be? Given Kenneth and Jessica were still together at the time and Jessica wanted to stay with him (I'm making this assumption based on the flashback in the Christmas episode where she tells a young Alison not to tell him about the second dress or "daddy will leave us" or something like that) it seems likely that a loved one is someone she would risk covering for and someone she could have been saying "what have you done" to. If possible maybe he is the one who killed Bethany/whoever it may be after this and then Melissa buried this person thinking it was Spencer who had killed Alison.
Also is it possible Kenneth found out Ali was alive and killed Jessica for whatever reason (if my other theory is correct then to keep that a secret or if he thought she lied about his daughter being dead,something like that). Given we've seen he's an angry person (like that outburst at Hanna in the earlier seasons) it is possible
Please let me know what you guys think, a lot of you would know the show much better than me and sorry if something like this has been written, I haven't had time to go through the forum
xx