Strategic leadership is really very simple- determine where you want to invest, develop a competitive strategic advantage, and get the right leader, who will then select the right team. From there, it is just good management. Unfortunately, many companies don't link the leader with the team and the strategy. Unless all of the pieces fit together, the business will fail.
All successful companies have a portfolio of products and probably businesses.
Some are growing, others maturing, and still others declining. A different type of leader is required to lead a business in each of the life cycle phases. Each phase requires specific attitudes and skills in dealing with change and risk. Each strategic differentiator requires different leader and implementation team. All successful business units or products have a strong, lasting, competitive advantage or differentiator.