Everyone knew that the Phantoms had Operators.
If the Phantom was a man then his Operator was a woman, like Adam and Silvana.
If the Phantom was a woman, then her Operator was a man, like Alexia and Louis.
Because of their nature, their powers, and what they had to go through on their journey, more often than not, it was the Phantom who dominated in their pair and the Operator who obeyed.
It might sound strange, but that's the way things worked. It applied to both Adam & Silvana and Alexia & Louis.
All four of them were different people, sure, there were certain similarities between them, both Adam & Alexia and Silvana & Louis, but they weren't copies of each other.
It was obvious who was in charge of each of the two couples. At one time, Louis had to go through a real stress and challenge to get the opportunity to be Alexia's Operator.