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Despite the wishes of the Blackburn Rovers defender himself, Christopher Samba never signed for Arsenal in the summer, with Arsene Wenger preferring Per Mertesacker at the final hour.
Which is a shame, as unlike the German, Samba is a proven Premier League centre-back who has learnt from experience and knows what it takes to stop strikers in England's top-flight.
The 27-year-old is entering the peak of his athletic career, as well as his sixth season with Blackburn Rovers, and is still putting in consistent performances week in, week out.
And it's such consistency the Arsenal back line could do with right now, with Laurent Koscielny's form dipping all over the place and Mertesacker still not adjusting properly to the demands of the Premier League.
Their defence also needs an authoritarian leader, not just a democratic one (i.e. Thomas Vermaelen), someone who will just tell the players plain and simple, "Sort it out!"
Because at the moment when Arsenal concede, the players look to the ground, or have goalkeeper Wojciech Szczesny trying to encourage the team again. What they don't have, and need, is a player on who will really shout at his teammates and give them a telling-off for conceding a goal, making sure it doesn't happen again.
Not only does Christopher Samba solve that problem, but he also adds that intimidation factor Arsenal's back four just don't have.
Per Mertesacker believes in the art of tackling, winning the ball cleanly and starting an attack from the back. Unlike the Bundesliga, that doesn't happen in the Premier League, with forwards in the English top-flight making sure the defender gets fouled rather than them being cleanly tackled.
That's another problem in Arsenal's defence, with no defender playing the forwards at their own game. Christopher Samba, however, does that brilliantly.