Great chapter to end this batch on! Mogami was implying that Hachina had other things in mind for Gakuto beyond just straight up winning the game. I think this could tie into what Kidou was talking about before in chapter 285 with them coming to the ship in the first place.
That aside, I don't think Hachina would leave Gakuto behind on the ship unless his plans involved killing Gakuto off in the first place... which would be quite a turn I suppose.
As ever, thank you for the translations, Team Duwang!