I look at it like this: goals keep you in the league, defences get you Europe or the title. Teams that are porous but score goals stay up but those that don't score much rarely survive in the league.
What’s often not mentioned about the good old days under Koeman is that we had a hell of a lot of squeaky bum 1-0 wins. It was undoubtably the defence that got us up the table, not our attacking superstars who are always name checked.

