Do you know how Morgan ended up on the other side of the continent? Via the Garbage Pail Kid’s helicopter???
Morgan went into a deep funk after the last firefight with Negan’s crew.
He vows that he will never kill any humans again, and he just started walking West. I think he got two long rides along the way.
Anyway, eventually he meets Madison and her kids, I think in California, but a lot of the filming is in Texas, and we see constant flash back and flash forward episodes, so I'm not completely certain how or where Morgan hooked up with Madison.
Also, there have been many hints that Madison is dead.
There are two more episodes, so we will find out soon.