Aubameyang's headers for Dortmund were never contested headers but usually outpacing a defender and heading home. We rarely play like that, and I don't think we should either at least at home we should be taking advantage of that immaculate pitch and keep the ball on the ground.
Our different type of crossing is one reason but the other is that Auba shies away from physical duels in the air. Laca is like four or five inches shorter and wins like three or four times the number of aerial duels because he doesn't mind a scrap, Auba on the other hand has been so rarely injured because he picks his battles and always has, comes with some advantages and setbacks obviously.