Jack Clarke’s incredible performances have been put under the microscope this term and he now tops the Championship for another statistic. Sunderland may have brought three players in during the January transfer window, but their most successful piece of business was keeping Jack Clarke. Michael Beale knew that keeping the 23-year-old would determine whether their playoff hopes would be strengthened or diminished. There are only a few players who can have such an impact on a team, but Clarke – who has plundered 13 goals and supplied four assists this term – is certainly one of those. In the ab…