Nobody talked about the goal total of the entire attack. We were talking about one specific player. If Sancho creates 20 goals for the other two in the front three, it doesn't mean that the combined goals of the other two would only be 20. Everyone in the squad will be creating, and everyone in the squad will be scoring (hopefully).
Well then we should, and people do talk about the goal total of the attack often enough, and the talk is similar. ‘What do you think would be a good return for Antony?’ Usually something like ‘10g/10a’. Right, so that is two of the regular front three that most people have listed, barely 20 between them. Where are the other 60 ofd goals going to come from? Martial?
There is no hiding, if you are part of a regular front 3 for a top club, you need to be aiming for 15 league goals minimum. Someone has to score. It’s very easy to shift the pressure from goalscoring and just say we want assists for everyone, but someone has to score our goals, and if these guys are making tens of assists, who exactly are they going to be assisting for if everyone who plays in attack is putting up meagre numbers?