We all saw Cook perform in the 2010 Ashes where he was at the peak of his batting, scoring 766 runs in 7 innings but in the other 4 Ashes series he remained in poor form and his average remained in the 20s in 4 out of 5 Ashes series.
He scored 3 centuries in the 2010 Ashes but only 1 century in other 4 Ashes series. In 2010 Ashes series he scored 766 runs with an average of 127 but in other 4 Ashes series he scored 1021 runs in total with an average of 26
Why so poor in the other series/