I shall sum up for you. Xinchub's person is valuable for secrets he carries both in his brain and in his biology.
He has been spearheading a Terran life-extension project for twenty-six years now, and has also been working to limit its implementation.
What, so the only people who get to live forever are the politicians and the fabulously wealthy?
No. As I understand it, he sought to avoid turning one-point-six trillion Terran sophonts into undead, war-mongering super-soldiers.
It it wrong for me to think that would be pretty cool to watch?