Board Thread:WARNING ALL USERS False Info\Spoilers/@comment-108.218.169.8-20130730130214/@comment-87.174.76.135-20130730141914

Well, Scott says: "What about your emissary?" And then Ethan shakes his head and the Scott asks: "They're all dead? Kali and Ennis's, too?" and Ethan replies: "All of them except for Deucalion's."

So they definitely said emissaries. Maybe they opposed the Alphas killing their Betas and that's why the Alphas killed them.