As several recaps have noted, the finale did a fantastic job of restoring some of the thematic heft that had been missing from season 3, which even Yost admitted to in
this postmortem with Alan Sepinwall. There were just a ton of characters and storylines revolving around fathers and sons and coming home -- Arlo and Raylan, of course, but also Arlo and Boyd, Quarles wanting to go home to Detroit to his adopted dad, and even Errol being banished from his home by Limehouse, his father figure, only to come back and essentially sacrifice himself to save Limehouse. And then the final scene, with Raylan wanting to come home to Winona and his unborn child, only to realize yet again he doesn't belong there, either, exiting with the line about Arlo saying he was just shooting at someone wearing a hat. Great stuff.
Throw in Quarles being disarmed and Wynn Duffy yelling "JESUS CHRIST!" right before the credits, and you've got one of the show's best episodes.
And domino, I think you can rest easy about Stonestreet from
Modern Family. According to
this, it looks like Yost just wants him as
a bad guy, not
the bad guy. In other words, probably a max of like three episodes. I kind of like the idea that Yost talked about in the Sepinwall interview about maybe doing three shorter arcs instead of one big one in season 4 -- that could help avoid the whole "Big Bad" thing getting done to death.