What are the possible pros and cons associated with this leadership style if used in project management?

The most effective leadership tactics are rational persuasion, inspirational appeal, and consultation are very critical in negotiations. The least effective were pressure, coalition, and appealing to legitimate authority. Inspirational appeal, ingratiation, and pressure were used primarily in a downward direction. Personal appeal, exchange, and legitimating were used primarily in a lateral direction. The authors caution that any tactic can trigger target resistance if it is not appropriate for the situation or is applied unskillfully. People are more likely to be influenced by leaders who match their expectation of what a leader should be. Implicit leadership theories are personal assumptions about the traits and abilities that characterize an ideal organizational leader. The assumptions are stored in memory and activated when group members interact with a leader. Influence is as much as inseparable from leadership, as eggs are inseparable from an omelet. You cannot exercise leadership without influencing others, and you cannot have omelets without eggs.
QUESTION: What is situational contingency leadership? What are the possible pros and cons associated with this leadership style if used in project management? Please share examples.
Dr. Sam
Reference
Robbins, S. P., & Judge, T. A. (2011). Organizational behavior (14th ed.). Pearson/Prentice Hall. Upper Saddle River, NJ.