The leader by will of the people differs from the leader by will of God in that the former is compelled to clear the road for himself or, at any rate, to assist the conjuncture of events in discovering him. Nevertheless, the leader is always a relation between people, the individual supply to meet the collective demand. The controversy over Hitler’s personality becomes the sharper the more the secret of his success is sought in himself. In the meantime, another political figure would be difficult to find that is in the same measure the focus of anonymous historic forces. Not every exasperated petty bourgeois could have become Hitler, but a particle of Hitler is lodged in every exasperated petty bourgeois.
~ Leon Trotsky
https://www.marxists.org/archive/trotsky/germany/1933/330610.htm
I contend that if Trotsky was leader of the Soviet Union, Spainish republicans would’ve won, but then WW2 would’ve been Britain, France, Germany, Italy, and America against the USSR, and Nazi Germany would still exist.