Talent was an excuse, or rather, it was only part of the equation. Khan's incredible skills with aliens mainly came from the sheer absence of biases and pristine curiosity.
It was one of the reasons why Khan had started his political career as a scout. It was how he had learned so many alien arts in no time, even achieving statuses that had never come within the reach of ordinary Ambassadors.
A peaceful life didn't suit Khan. He wanted adventures. He craved experiences that challenged him and broadened his perspective. That had been a consistent theme throughout his journey. His curse had simply soured it with dark feelings, trying to hide that instinctive nature from himself.
However, those dark feelings were no more. Liiza had taken them away, making Khan discover and realize his true interests. His bad habits had remained, but they were just that, and time was bound to correct them.
Besides, there was another issue connected to Khan's desire.