Its a little overrated if you ask me.
When the team plays well and Zlatan is on the pitch = it's his presence and shouting!
When the team plays well and Zlatan is not on the pitch = he doesn't need to be on the pitch for his leadership to have an effect!
When the team is losing without Zlatan = this group just plummets without it's leader!
When the team is playing like shit and Zlatan is one of the worst performers, hampering the team with his immobility, walking, sulking, whining and complaining, such as against Spezia, Sampdoria, Lille & Atalanta = .............