By the time Ready Player One ends, Daito and Sho are both still alive and kicking, and Wade decides to share control of the OASIS with them, Art3mis and Aech.
Keeping Daito alive in the movie also pays off during the final conflict, because after sitting out a fair portion of the battle in the OASIS, he dives in and transforms into a life-sized Gundam to significantly weaken Sorrento’s Mechagodzilla.
While Daito is around Wade’s age, Sho is an 11-year-old kid, making it all the more impressive what he’s accomplished within the OASIS.
From there, these two directly help in the effort to find James Halliday’s Easter egg and thwart IOI’s plans.