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A good game plan does not win you games, you still need the players to execute the game plan. If you had 4 of the best coaches in the world collectively coaching, say, Japan for a year solid and then played them against a combined team from the 4 NZ franchises, thrown together at the last minute with zero coaching, Japan will still lose 10 times out of 10.
Break it down to a basic level - you essentially need to get the defence on the backfoot, put continual pressure on them, get them backpedaling until they are in disarray, then invariably there will be holes and quick ball to the backs will produce tries. But in order to do that, you need forwards that have the pace, power and strength to punch holes in the defence and make the gain line plus the ball skills to hold onto the ball. We don't have those forwards that can do that. Time and again our forward runners are either tackled on the gain line or knocked back behind the gain line, phase after phase. If the ball isn't knocked on, it's then slow ball, shipped to the backs who are expected to do something against a well organised and structured defence that has not been under pressure. There is no magical game plan that is going to work whilst this very basic and fundamental flaw exists.
Sorry completely disagree there - Israel Folus, Michael hooper, Kurtley Beale, Wycliff Palu, Alofa etc etc Those first 2 are arguably the best in the world in their respective positions.