There are three ways to be a "killer" in team sports. You can have "hot-blooded" killers as leaders [I've found that these teams run up scores pretty well, but have problems folding when they're behind---i.e. usually they're like bullies]; you can have "cold-blooded" killers as leaders [I've found that these teams are like miniature clones of their coaches, accepting no sloppy play no matter what the score, with the players themselves policing that]; and you can have monstrous robotic machines, which function automatically as meat pulverizers almost outside the personality characteristics of the human functionaries. All the coaches can do really is to try to create the monstrous machine. The players must find it in themselves to locate their leadership quality within. I used to say to my students: My job is to bring the knowledge in an understandable fashion as far as your eyes; from there on it's up to you.....by the way, I've assumed that for the purposes of this thread, we are talking about leadership in a "we're ahead" situation, not a "we're behind". In "we're behind" I'll take all the emotional "we're not going to take it anymore!!!" that I can get.