I assume it'll be sometime after his son died and after Rick and Michonne found him holed up in that building with all the traps. But why would he ever go to Mexico? Did he just decide to wander off in a random direction one day? I can't imagine any motive that won't seem like something the writers just pulled out of their ass.
Yeah, they're clearly pandering to TWD fans by using such a popular character. Won't effect my enjoyment of the original, though. Fear was always garbage, and became even worse when they killed off Cliff.
I don't even flirt with her or anything. She just has a nice rear. I was disappointed because she's pretty much the only person there I can stand at this point.