Mumbai, Sept. 18 -- A way of functioning seen as defiant by the Board of Control for Cricket in India (BCCI), disagreements over selection, players expressing their dissatisfaction with the captain's way of doing things, the World Test Championship defeat, R Ashwin's omission from the fourth Oval Test against England, and the cancellation of the fifth and final Test in Manchester-each of these factors played a role in Virat Kohli announcing that he will step down from T20 captaincy after the upcoming World Cup, according to several people familiar with the events that led to his announcement....