We got to see quite a bit of him, both in the midst of his journey (where he apparently gets a leg injury) and mixing it up with the other characters.
And I’d wager that a large number of fans watched the trailer to see Lennie Jones’ Morgan being enveloped into Fear the Walking Dead’s story.
The Season 4 trailer was unveiled at the end of the latest Talking Dead episode, but AMC went hard on promoting Morgan’s arrival during commercial breaks for that show and that of The Terror’s season premiere.