He needs to be removed from his post and possibly the city. I don't think he can be fully trusted. After the whole deal with rasputin's bunker and him walking through the back door (without helping or even calling in a stand down order), and how he turned his back when a vanguard leader was killed, it's time. He needs to go. I have said it before.. the way zavala has been acting, I wouldn't be surprised if he turns out to be an enemy character in future content. Hopefully, I'm wrong and he snaps out of it, but right now it looks like Ikora will have to hold everything together on her own.