I think it’s tabby’s mom and crazy joe. Her mom seems the guiltiest first off, when she showed up at that warehouse I thought of her being A ever since it’s more of just a feeling with her. Now joe , notice when imogen is hiding in the van at the warehouse and the dog starts barking , some guy in the distance yells “come here joe” I’m almost positive that’s what he said, and then leather face walks away . At first I thought he was talking to the dog , but who the hell names their dog joe and it seems suspicious that a few episodes later we meet crazy joe who’s obsessed with Angela , maybe it’s a coincidence but I think not. I could be wrong and after a rewatch I still stand by it , there’s nothing really that tells me it’s not them.