Unique
Raymond was a known figure in the Global Army, but very few people were aware of his deals with Khan. That wasn't much due to Khan, either. Luke, Luke's father, and the entire Cobsend family had every interest in keeping those illegal activities a secret.
Moreover, it stood to reason Raymond could cover his tracks well. After all, his activities involved pieces of Nak and illegal experiments. He would have never achieved anything if his secrecy was any less than perfect.
Nevertheless, even someone as secretive and resourceful as Raymond couldn't do anything against a motivated noble. Rebecca's assets had to outclass his a hundred to one, and her goals probably carried more intensity.
The secret details seemed to confirm Rebecca's tale, and Khan's senses also gave the okay. Her story even sounded reasonable when Khan thought about it.