Yepez was on the postseason roster. But for the service time issue, Gorman might have gotten some big league at bats -- although with the way the minor league season was set up, playing through September, it made more sense for him to get more work in the minors.
Nootbaar is part of this equation, based on his minor league, big league and fall league work. He could take a bunch of DH at bats. Also, the team can use the DH slot to rest fielders.
Going forward, if there is a DH then pinch-hitting won't be a thing. Oli Marmol made split assignments in a game for matchup purposes, giving one guy two at bats, then another guy two at bats. In such a world, having interchangeable position players will be key. I have advocated for only starting-caliber players for those jobs.
I could certainly see Yepez and Gorman going back and forth from the minors next season as they continued their growth. I could see a veteran lefty hitter with first base skills in the mix. But I would be surprised to see the team spend so much money on a veteran hitter -- without subtracting another hitter, like DeJong -- that both had their development set back a year.