Khan didn't have the time to earn the Nele's trust, and Jenna knew it. As much as Tamara acted as living proof of his goodwill, the Nele had to remain careful and wary.
The offer's magnitude would even make the Nele who had started to trust Khan wary. A planet was too big and grand a gift for that species.
Besides, years had passed since Khan had interacted with any Nele. Even the aliens he had met on Milia 222 would think the offer was too good to be true. Perhaps Caja would be an exception, but the cumbersome ship had another, probably the main one.
Jenna trusted Khan with her life, and seeing him with Liiza only reinforced her belief that he hadn't changed in those years. If anything, Khan had become more of himself, discovering parts of him outside his curse.
Khan had also always been selfless, so Jenna knew he had made that offer because he knew he could keep the Nele safe. Convincing the Nele was the problem, and only a fellow alien would do.
