I think the whole leaving with Tavia/staying at camp will be the biggest thing. Other than that just small bits of dialogue maybe, I can see the Eddie thing coming in to play, Russell's loyalty with Nate and Becca's attitude and opinion of Shel depending on what you decided to do with the Steph situation. But yeah this could just be small dialogue stuff, the main thing being who goes with Tavia.
I'd be more hopeful for them having a fuller role in season 2 if not for the fact that everyone can be split up at the end. As is, I kind of expect a few cameos of sorts depending on who goes where.
I think that everyone will go with Tavia anyway. Something similar to Russel story or boat situation in Ep.5 will happen(if you chose not to get into the car walkers surround Russel and then he goes with Nate eventually / doesn`t matter who goes with Lee and who stays, boat will be stolen anyway).
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P.S. Sorry for my English