Although the forces had more options, Eneas only divided the forces into three, reducing the boarding forces further would be too risky. The weapons companies were happy to provide Thanatos not only with the best technology but also with good space suits, equipment and weapons according to the specifications set by Eneas. Basically, having the little hero as a leader made all the companies want to collaborate, then the videos of the war exploits themselves would be free advertising.
When the Thanatos began to be built, it was not known who would be its officer, but Hephesto insisted as soon as he learned of Eneas's exploits in the war that it was best to tell all the collaborators that the ship was for the young man. It was a ruse, although something really very possible at the rate at which Eneas was advancing, so it did no harm to anyone and finally ended up in the hands of the young Major.