This is an extended version of a 코멘트 I left on a link after it was revealed that 모건 would be the crossover character between TWD & FTWD.
I'm not all that enthusiastic about the idea, but it is technically possible given the two timelines. The way I see it, it could go down one of three ways. But first, a look at what happened when with Morgan:
-Day 60: 모건 and his son Duane met Rick in King County, Georgia.
-Day 314: 모건 met Rick again in the same town. Duane is gone, and 모건 has set up all kinds of walker (and human) traps in town.