Welcome to ZN.o, @Chrisball96! Glad you're here!
Here 👇 is the article from the ABJ where JoeMo comments on committing to Tahj over Undercuffler.
Idk if this is a subscriber only article, but in case it is I'll paste a few sentences for you:
“Jeff played in the win against Northern Illinois last year and did some nice things and obviously [replaced Irons in] the game against Buffalo,” Moorhead said, “but has had some opportunities this year and really hasn't kind of stepped up to seize that opportunity that was presented [after Irons was injured].
“Then, quite frankly, with what we're trying to do in the run game and trying to help out our offensive line that certainly needs a lot of help, Tahj provides a different element in the run game that Jeff doesn't. So part of the idea was we've got to do some things to help out the offensive line and have Tahj get some run yards, which he did today. So that factored into the decision.”
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Go Zips!