Pulisic is not a striker, though. He's an attacking mid, whether used on the wing or centrally. His mission is basically to do what Kagawa was trying to do today: send the pass into the box to create trouble.
Are you comparing Auba's form this year to last year ? If he was in good form he would've scored in the dying moments of the game off of Pulisic pin point cross , which by the way was a gimme compared to Pulisic attempted volley from a shrap angle .