Agger for the quality, Carra for the leadership. Swap Kyrgiakos in when we need a stronger CB with a better aerial presence to counter teams like Bolton, Blackburn, Wolves, Stoke etc
From the looks of it, Woy prefers a CB pairing (as opposed to 2 individual CBs). That means they work as a unit instead of having individual responsibilities.
Old system:
Agger swept up balls that the slower CB (Carra in the past) missed. He played his way out of trouble, he hung back while Carra closed down. Carra closed down, provided the physical presence and layed the ball off for more creative players and was more of a threat aerially. Carra was always the leader out of the two. Zonal marking was more suited to Agger.
New system:
Carra is still the leader, both players work together to ensure nothing gets past. No longer does on CB have one role and the other have a different role - they work as a team to clear the ball upfield and regroup. We rely on a more physical presence at the back and man mark accordingly. Man marking better suited to Skrtel.
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