Zeus did not expect to arrive before the end of the battle; no matter how fast the battleships ran at maximum speed, in all likelihood they would arrive long after its outcome. He only hoped that the reinforcement forces he had sent ahead of his fleet would serve to save the Helena space station. He was a fundamental piece in the intergalactic defense, not only of the Hellenic navy but of all interstellar forces.
Furthermore, he couldn't say that he wasn't worried about his grandson, but he was a soldier, a warrior just like him, or even better, the destiny of a soldier was to face death with honor, if he found his grandson's corpse upon arrival, he would He would cry of course, but he would be proud of the boy and his bravery.
