Koscielny is fvcking great at tackling and is a much more talented defender than Skrtel will ever be. He is pretty good aerially too if not as good as Skrtel. He is A LOT like Carvalho but even quicker-surely the fastest cb in the world and like him is a bit underrated I feel. He surely can make a mistake by being too committed at times but he doesn't switch off. Players make mistakes but Kos recovers well very very quickly. Aguero and Torres hate him with a passion of that I'm certain.