"It has to do with the fact that Ford, for all his greatness, is an Irish egomaniac, as anyone who knows him will say"

Henry Fonda's quote is referring to the greatness of Ford, however also to his egotistical nature. Ford is an Irishman, and thus, he tends to be excessively honored and also boastful. This is something that any person who understands him can attest to. Ford is a great male, but his vanity can in some cases hinder of his success. He is usually too concentrated on himself as well as his own achievements, instead of the accomplishments of others. This can bring about an absence of cooperation as well as team effort, which can be detrimental to any job. Ford's egotistical nature can also result in an absence of humbleness, which can be repulsive to those around him. Regardless of his achievement, Ford's egotistical nature can be a hindrance to his success.