Hayato said, "Not much."
He wasn't brushing Coulson off. He genuinely didn't know much.
He didn't care about Thanos's subordinates. It didn't matter how many there were, so there was no need to care. What he cared about was Thanos's strength, but Gamora and Nebula didn't know, because their abilities were limited and they couldn't see through him. Throughout Thanos's campaign of conquest, no one had ever forced out his true strength.
All they knew was that Thanos could easily destroy a planet.
Among the people Hayato knew, Zeus and the Ancient One probably knew best. Both had fought him before.
But Hayato had never discussed this matter with either of them.
So he didn't know much.
But Coulson didn't give up. Compared to Hayato, who knew little, he knew nothing at all, so any scrap of information was worth prying out.
Coulson kept pestering Hayato with questions.
He asked about the Eternals of Titan and Thanos's family.
Hayato knew that Titan had been destroyed by Thanos, with only a few thousand survivors left. Thanos's father had been the king of the Eternals, while his older brother had been the heir. His grandfather had been the Eternals' god of time. Aside from those direct blood relatives, he also had two adopted daughters: Gamora and Nebula.
All of them stood against Thanos.
Tsk, tsk. What a way to live.
When Coulson heard that Thanos was secretly in love with the Goddess of Death, his first reaction was that the Goddess of Death really existed. His second was that this guy was indeed insane.
Hayato also gave Coulson a quick lesson on the five great gods of creation: Galactus, Death, Eternity, Infinity, and Oblivion.
Fitz, the resident nerd, listened as if he were hearing a heavenly scripture. He muttered, "This... even comics