1. Guru Greg demoralize the whole team by intimidation and his Tuglak style experimentation.
2>> Greg wanted to make Irfan a Ricky Ponting, Dhoni a Gilchrist, Sehwag a Dravid, and Dravid a yes man. He never allowed an atmosphere for the individuals to reach their potential in their own style.
3>> To prove that he was the boss, he was pushing and promoting his own young brigades who did not earn their spots yet. He went further by introducing politics and piting one individual against another and divided the team in fragments and ultimately destroyed team spirit completely.