I know A.D isn't Toby, but he is the only one in the show that has motives to hate all the liars. After all this time, I'm kinda disappointed if A.D it's just a random sociopath obsessed with the girls... like, come on, this isn't some random episode of criminal minds, we're talking about years! This person molested them for years! This person has to really hate them, and hate them all. Ezra kinda fits as a sociopath since he stalked them like one just for writing a book (I watched a theory about Ezra and everything fits perfectly but the motive is just about Alison, so it doesn't make sense why the other girls are tormented too) Toby has a pretty big motive. He spend some time at jail (kind of) because of the jenna thing, and maybe not all the liars actively participated in blinding her, but they all knew Alison did it and they knew she blamed Toby and none of them did anything to stop it. They let Toby take all the fault. If the jail time isn't enough, when he came back, the entire town treated him like a freak and bullied him, even the girls treated him kinda bad. Against Miss Dilaurentis he has another big motive: she paid Wilden to cover his mom's murder. He not only loose his mom, he also had to deal with the fact that she killed herself, as if he wasn't enough reason for her to stay and get better. Wilden was pretty involved with this, and he got killed too, Charlotte was too and she was killed too. Bethany Young is nowhere to be found, but that will explain why Sarah Harvey was kept cautive, she was replacing Bethany Young in Toby's mind.... He is lovely and I'm pretty sure he isn't going to be A.D or even involved at all, but I can't think of anyone else that has a motive against all the girls. Most of the suspects have something against Alison or some of them have something against Spencer or the Hastings / Dilaurentis family connections, but Aria? Hannah? Emily? What's their place in all of this? Are they just friends with the wrong people? Being in the wrong place at the wrong time? Sorry but this sounds pretty absurd to me. The other person I can think about having something against all the girls can be Ian (but he's pretty much dead) or Melissa 'cause their support for Spencer's speech against Ian made him runaway and finally killed himself, leaving Melissa alone with a baby that later died. Jenna has motives too but as we are shown in the last episode (7x11) she's at best working for A.D, but she doesn't even know who A.D is, so... I don't know, thoughts? Haha