Outsider
Khan's attunement with mana wasn't a secret. Even if he wanted to hide it, his many trips would get in the way. He always had to cross scanners and other machines during travels, so the Global Army knew how quickly he improved.
Usually, soldiers would require infusions of synthetic mana to achieve such quick improvements, but things got harder and more expensive at the higher levels. The recovery time also increased, stopping even the richer descendants from abusing that training method.
However, the Global Army now had an example of a soldier who could improve faster than anyone without any apparent repercussions. Khan had also begun exposing his unique expertise to various parties. It was only a matter of time before the higher-ups' interest became too great to quell, and he was painfully aware of that.
"I won't give away my training method," Khan announced.