Brown is the shooter - or Brown related shooter. It is literally the only thing that makes sense. Brown isn't just going to dissappear into the sunset, she is back for revenge and russell is next. She has lost everything - her home, her kids, her job... duh! What else is she gona do?? We already know shes cold blooded and has a beast within.
That makes more sense, actually. Russel and Gamby were appointed only as temporary principals, and Russel is crueler (see e. g. their blackmail scene with Belinda in the woods), so...
Ray admitted to Gamby that he was jealous.. The look in Ray's eye when he saw the dirt bike gift, was disbelief, that he was changing for the better, with his plan well under-way... The mask was worn out of disrespect from rays' school to gamby's. NOW, if you see the cast for "season 2" (Danny referred to the first season as 18 episodes...) RAY AND THE DAUGHTER ARE GONE. I bet he shot Gamby and kidnapped her. + Gamby's ex wife is only in 3 episodes, then she's gone too! Meanwhile, (for example) the police officer gets 8 out of 9 episodes, Lee's "Lawyer" gets 1 episode, Ray and Janelle ARE STILL GONE... I see a story unraveling here...