Still he is the most evolved human "warrior" the Assassin wants.
Just think about it: except the very first trailer they left out Rory from every footage. They showed us Assassin, they showed Fugitive's death at SDCC. Those who have not read the script these elements would be everything...now they think: "they showed us everything already?"
The filmmakers have to keep plot twists in secret in order to let everybody be surprised at the premiere.
That surprise will be Rory's role.