You can throw as many players as you want behind the ball. But if you can't do something as simple as marking out a player, inviting the opposition to test that defense is utter idiocy. Always has been, always will. It's just as idiotic as thinking Amauri and Diego as the only attacking players will be able to win the game for us by themselves, or fielding Marchisio as a left-winger.
It's just fucking retarded stuff. That's all there is to say about it.