How much?
Michigan left tackle Jon Runyan, who provides deeply technical insights into his opponents, said Epenesa was tied with Ohio State's Chase Young as the two toughest defenders he ever faced.
"A.J. exploits the weakness of what I play," Runyan said. "I'm a vertical setter, and the weakness of a vertical set is what A.J. loves to do: bull rush with a one-armed stab. He's able to catch me leaning a lot, catch me off guard. Early in the [2019 Michigan vs. Iowa] game, the first three or four drives, I wasn't really keying on his shoulders. He started running downhill, and I wasn't able to get my hips down and react to the bull rush."
Purdue tight end Brycen Hopkins also singled out Epenesa as one of the toughest defenders he ever faced, adding a most unusual compliment to his scouting report: "I thought he was a great player. He was physical, but at the same time he's a cool guy. He wasn't a jerk out there. ... So I thought he was a great player, great guy. He came off the ball with an explosive power."
And then there's teammate Tristan Wirfs, one of the stars of Friday night's offensive line workouts. Wirfs didn't hesitate to name Epenesa as the toughest defender he ever faced. Sure, he may be a teensy bit biased, but players rarely single out teammates when answering "toughest opponent" questions.
"We had some battles," Wirfs said. "When I met with the Broncos, they said a scout was there [at Iowa practice] and I didn't lose to A.J. So I said, 'I'm glad you were there on
that day.'"