There is a POWERFUL (Separate) element, but the power is not from us, it is from God. He is the authority and He uses leaders as a channel of His authority. Just like God's power, leaders are to use power to free others, not control them. The power is used to serve others not be served.
The RELATIONAL (Belonging) element of leadership is utilized when leaders rely on God's power, because that allows a leader to relate. You can be gentle and serving when you rely on God's power, but if you try to be powerful or show that you are in charge, that will prevent you from being gentle or serving. Worse yet, it tends to create a structure of rebellion in people towards you.