Mckennie has end product, both in crossing and runs into box to join attacks, even tho he is playing in wing role he is not suited to. Even beats his man now and then.
And that's for the attacking, he does plenty of defending in that role too.
So far Weah when he plays and is not hiding from ball, he runs straight line wide and overhits a cross by 20-30 meters every time.
Litterally does nothing else in his minutes in offence. Not to mention is completely exposed defensively.