You can grow by leading followers. But if you want to maximize your leadership and help your organization reach its potential, you need to develop leaders. There is no other way to experience explosive growth.
Leaders who attract followers, but never develop leaders, get tired. Being able to impact only those who you can touch personally is very limiting.
In contrast, leaders who develop leaders impact people far beyond their personal reach. Every time you develop leaders and help them increase their leadership ability, you make them capable of influencing an even greater number of people.