This theory is a little vague, but I’ll explain to you the basic idea idea of it.
I don’t think that Alison is A. I do think she’s alive, but I think there’s someone - or many people - above her. I think she’s being held hostage, forced to watch her friends suffer. Or she may be on the run from people who are going to hold her hostage and make her watch the girls suffer. We know she was trying to work out A and get close to them, I think she made the mistake of getting too close to her enemy. I think she slipped up somehow in her game, and got herself into this situation. When Alison (possibly) comes to see Hanna in hospital when she almost gets run over by A, she says to her that “telling the truth to the wrong person at the wrong time is how I ended up where I am”. If she really did come and it wasn’t Hanna’s imagination/painkillers, then that does sort of tie in with my theory.
So who do I think is above Alison? I think the A team is like a big army with different ranks, but without any of them knowing where they are in all of it. I think that Mona and Toby are near the bottom, Mona being above Toby, and Mona thinking red coat/Alison is in charge, when in fact she is being controlled by someone else.
I think whoever’s at the top is only aware of controlling a few people. But those few people then have their own secret minions which they haven’t told anyone about, and the minions have minions, and it all turns into this big complicated army with ranks, but that are all muddled up and that none of them know about. I also don’t believe it was only ever Mona who was A, and I think it’s possible that whoever’s at the top was once just working with Mona, and is still in contact with her but without either of them knowing that she’s being controlled by them.
So in conclusion I think that The A Team is a large group of people who don’t realise they’re all connected. The people in this large group could be any number of people, and lots of different people. Possibly Jenna, Melissa, Shana… There are so many people who hated Alison, and even people such as Jason - who we have reason to believe was involved in the A team by killing Garrett - who didn’t hate Alison. It’s even possible that everyone is A in a way without realising it.
That’s my theory on the A team, feel free to let me know what you think and if you agree/disagree. :)