If people like this theory, I'm gonna officially coin it S=S lol. Here goes -
Stephanie, the mysterious voice speaking on Eugene's radio offers hope of a new, large communty of people over in Ohio. It looks like the story may go there, but what if it's all just misdirection? I'm proposing that Sherry is acting as Stephanie in order to make Alexandria even weaker by sending some of it's key warriors away, leading the saviours to attack and take over what remains.
The great misdirection: The Whisperer War may well be a cover up for an even bigger plot invloving civil war and friends turned against each other. Wars and New Communities are walking dead staples, so maybe Kirkman is setting them in order to subvert his own tropes and misdirect the audience. Let me know what you think?