Two titles --the maximum along with Chennai Super Kings and Mumbai Indians -- and four playoff berths in six seasons thereafter show that the turnaround has been as spectacular as the slump. Through stats we’ve compiled the four key players and a dark horse that has the potential of changing the fate of the tournament. Yusuf Pathan and Kuldeep Yadav will be the surprise factor for Kolkata Knight Riders. Shakib Al Hasan and Trent Boult will be an interesting fit for Kolkata Knight Riders this season considering their form. Umesh Yadav’s lethal form with the ball against Australia will help KKR strengthen their squad a lot more.