Surely they can't attribute all of those 6 points to Bannan when calculating his value. That would be ridiculous, only a nutter would do that. It's a team game, remember? What about Chamakh who scored the goal, surely he gets at least half of the credit? What about Jerome who assisted Bannan? Half the credit again surely?
And that's without even considering the players who earned the clean sheets. Defending isn't Bannan's job remember.