For the post-credits of the episode, Morgan shows up at the sign Rick altered. At first I thought that Morgan was showing up a few hours after Rick and his men left, but now I am learning that scene takes place a few MONTHS afterwards. How?
About a month after that, Rick and his group arrive in DC and Morgan joins them days later. How is this possible? I have a guess.
Morgan and the group on Fear, will be forced east sometime in season 5. They soon end up back in Georgia. While this happens, Morgan will get separated from the group and see the sign. I know it would be insignificant by then, but it is possible that Morgan never learned of Terminus.
Really an out there theory, but still a good one right?