Everyone says the two strangers in the epilogue are Omid and Christa but I felt that scene was too ambiguous to really determine anything. Here's what we know.
-Christa is pregnant, would her and Omid put the baby first and just left Savannah after Lee jumped?
-The only destination you can give Clem, Omid and Christa to meet up is the train. However we also know the noise of the train attracted thousands of walkers and the train is not safe.
-Omid and Christa were only with the group for 3-4 days. That's not a lot of time to bond. Would they risk their lives for a girl they just met?