Not sure at our performance levels the system ever makes much difference. We do well in games when we mark men, challenge for the ball and have some kind of attacking intent.
When we retreat into 2 lines and mark space instead of players and stop challenging for the ball we gift possession, chances and usually goals. Known in modern coaching parlance (bullshit) as keeping your shape.
You could never accuse Wilcox’s teams of not marking men or challenging for the ball – the attacking intent was often missing though.