That's definitely some good reasoning.
Since you said that Daryl is a man of action, I think he joins the farmhouse very soon. Andrea probably goes with him, and she's going to talk Shane into leaving on their own. But since Shane risked a life to save Carl, I think he sticks around. This could lead to her wanting to leave and shooting Dale in the process, if they all finally get met up.
I think that Daryl is the most reasonable guy in this group that is still on the highway, so I think he will finally make the call that finding Sophia is not going to happen. If that happens, I bet Carol becomes unreasonable and just stays on the highway; which leads to Dale making the tough decision to stay with her or leave her behind. Once he leaves her behind, I have a feeling that Sophia is a walker now and she will end up biting Carol.
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