I agree with post #2. Attempting to use a theoretical leadership model can backfire. Leaders have to lead in a way that matches their personality. If a leader attempts to be a person he is not, then he will fail. It is more important that the leader know himself, and his skills, than to try to maintain a model. There are many gimmicks and slogans in business these days. Ultimately, falling victim to a slogan is something to avoid.
I think that different theoretical models bring out different aspect of leadership qualities. In the end, I think that individuals select a leadership model that is more suited to their own strengths and one that will bring greater effectiveness in the relationship between leaders and those who follow. At the same time, individuals might be able to to integrate aspects of different models in a holistic vision of leadership. For example, Trait leadership argues that specific traits or qualities of leaders is what defines exceptional leadership. At the same time, contingency models of leadership assert that individuals who are great leaders are ones who understand particular situations and contexts and are able to utilize them to their advantage in leadership. In the end, the selection of which model to embrace is directly contingent on what model fits the leader and accentuates their own strengths.