So we can't help but wonder if Marlene King's original idea for the identity of A.D. would've been better received.
“Originally my mind was going to Wren as A.D., but we had to be realistic and there have been times when we really needed a character who wasn’t a series regular and we couldn’t get them on the show,” Marlene King told Entertainment Weekly.
“The show is so deeply rooted in mythology and I’ve always said you have to know the ending before you know the beginning or else it won’t make sense, so that dictated that we needed to make A.D. someone who was a series regular.”
Unforch, the actor behind Wren was unavailable for the finale so he was written out.
Also, Marlene claims she wanted the identity of A.D. to be a series regular who the viewers were familiar with.
So it looks like it was all just a twist of fate that Twincer ended up being A.D.!
Nice to know it was well thought out...