Thanks to Eneas's insistence, they put the Amaru on the transport. It might seem eccentric, but it also marked the cadet's freedom to leave at any time without being at the Grand Admiral's disposal.
Eneas and Zeus were chatting in the privacy of the transport ship calmly; they had many years to tell each other, and in this way, the grandson told him what his childhood had been like, his education, his mother's struggle to support him alone. He even told her how he worked part-time while preparing for the academy, and how he spent most of his savings on Amaru.