Highly attacking fullbacks (such as Glen Johnson) are vital to the success of the Liverpool system. We don't have an out and out winger, wingers in general are becoming far less and less popular due to the fact that if they're not technically proficient enough to play a more central role when need be, than they are very limited in their contribution to the team. He provides our width, crosses and wide passing options down the right flank (better than Kuyt does anyhow) and offers decent cover in defence. When he surges forward, we have 1 or 2 defensive midfielders to ensure there isn't a quick counter against us if we're caught out.
The fullback is the only position on the pitch that generally has space in front of them at all times, so having one that can dribble, pass and cross very well is extraordinarily handy. Now I know you're saying but he's a right back so his primary concern should be to defend. Enter the defensive midfielder, surely midfielders are supposed to contribute to a little bit of attack and a little bit of defence? Mascherano simply doesn't contribute to attack, because our fullbacks do. Think of Mascherano as a defender and Glen Johnson as a midfielder. I know that sounds stupid, but so did a lot of things before they became the norm.
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