Gautam Makunda’s book on leadership:
Under most circumstances it doesn’t matter much who ends up as leader. If leaders are Filtered, one can easily substitute for another. Under some extraordinary circumstances … an Unfiltered leader can come to power who takes his or her organization to disaster or glory.
At last a systematic look at leadership. Looks at Jefferson, Lincoln, and Wilson; Chamberlain and Churchill. The Filtered make little difference. The Unfiltered are Extreme, like Churchill, and can make a big difference. (Also, though not mentioned, Adolph H.)