Even when he's not able to be a nonstop chance generator, Ansu showed he was capable of doing the system stuff well in games where it's too uphill to stand out as the main man. Really good passing and movement as part of a unit, defended and pressed hard winning 2 tackles (I'd be surprised either Cou or Dembele ever had 2 tackles in a game in their entire Barca careers), was always aware and active.
He had 1 dribble and nearly scored a goal on that rebound from Arthur's FK delivery, very unlucky deflection on a shot that looked like it was going in. He strikes volleys very well, first time ground finishes very well, and can head the ball. Those are signs of a very elite scoring talent at these early stages in his career, the kind that separate from the pack.
And, like others mentioned, he was doing a lot better in general on the LW and may have had a straight up great performance if he played there from the 1st minute.