The weakest of the plot threads was at Hilltop, as we see Maggie and Gregory discuss their difficult situation. Gregory seems to be contemplating killing Maggie for a moment there, as he knows she threatens his authority. However, we later see that he isn't even capable of killing a Walker. Maggie has to do it for him. I think my problem with this plot thread is that I too have trouble understanding why Maggie is staying at Hilltop. She could go back to Alexandria now, couldn't she? Especially since the doctor is gone? And Gregory is beyond unpleasant. He's just not fun to watch. He's a wimpy and annoying irritant and nothing more. I don't feel a connection to him. And that can be fine sometimes, sure, but it makes it difficult to spend extended time with his character.