Because I think he can emulate Franz Beckenbauer. The sweeper must always be "the last player" in defense (after the goalkeeper, of course). His job is to close down gaps left by other defenders. The libero roams laterally, a few meters behind the last line of fullbacks. He must try not to sway too far towards the flanks. The sweeper analyzes the development of plays, anticipates where open angles and passing lanes are forming and make quick decisions about dealing with them. Because they never mark enemy attackers, sweepers can move a great deal forward when their team is in possession of the ball. This frequently finds the enemy defense unprepared as an unmarked player is unexpectedly introduced to the play. Overall, the sweeper should be very perceptive (usually experienced) with good ball handling skills and confidence. http://expertfootball.com/coaching/positions.php