"Both?"
"When we combine like that, we could decide to let an independent consciousness control the 7 Day Wolff form, or choose anyone of us to be the prime consciousness. Whoever takes the position of prime consciousness will command the body while the others serve as support and help him stabilize his power.
This is because when we are in the 7 Day Wolf form, it puts a lot of pressure on the mental energy of the prime consciousness. If the rest of us aren't there to support and help him stabilize all that power then he won't be able to fight at full capacity. Also we can't stay in that form forever, or else if the mental energy of the prime consciousness is exhausted the one controlling the body could lose consciousness.
