>>53645244Daiki being involved in Horizons may help boost the amount of art Goh gets going forward. Some of his fans were still going to draw him regardless, but hearing his voice regularly in the anime might lead to drawings that would've otherwise not existed.
And if Goh does appear in Horizons... the amount of new fan art that follows will be insane. With his VA still clearly being available/interested in being a part of the anime, Goh might actually stand a better chance of appearing in Horizons than most other Ashime characters.