Aria is -A

I don't believe in this theory but a lot of people do, so I thought I'd post some theories of Aria being -A.

Theory 1 - In season one Mona shouted to Aria 'Hey Big A wait up' and Marlene tweeted a fan #BigA when they asked if they could have a hint on who -A was.

Theory 2 - In 2x25 the writers said -A would be 'unmAsked' Aria took off her mask at the masquerade ball...the writers also said that -A would be dressed as the black swan, Aria was. 

Theory 3 - When the girls were on the halloween train in 3x13, Aria wrote her name on the window, her A was the exact same to how -A writes it, coincidence?

Theory 4 -  On one of the promo posters, Aria's feet are handcuffed, she's also the one to do the 'shh' in the title scene, does this mean Aria is hiding something bigger?

Theory 5 - Mona said to Aria and Hanna 'Miss Aria You're A Killer Not Ezra's Wife' this spelt out Maya Knew, yes but why would Mona specifically say 'You're a killer' if it didn't mean anything?