Kolkata Knight Riders John Buchanan's captain concept is nothing but a mockery of the game, says former India captain Dilip Vengsarkar.Ridiculing Buchanan's suggestion, Vengsarkar said he would be glad to see KKR captain Sourav Ganguly [Images] back at the helm of the Kolkata-based Indian Premier League"I'll be glad to see Ganguly back at the helm of the Knight Riders. This is ridiculous," India