I do wonder if it might be possible to add in there that their bond is stronger than fate itself. This way we make it clear exactly how both of them avoid the destinies they know they have with the Sith throne.

EDIT:
"Now, the Emperor wants us to fight each other, so the strongest of us can inherit the throne. But he doesn’t realize we are connected as one in spirit by the raw power of the Force. Our bond transcends fate itself. We can end him and the Sith, and create a new order, together…”