>>41770401I mean that's logical speaking, but adults aren't entirely logical? These are still young adults in charge of and directing people who are younger than them. They don't want to see them get hurt, and they, as older folk, see it as their duty to take care the situation. The younger ones this case already have a task at that, completing the gym challenges and making it to the finals.
Leon and Sonia aren't going to be as irresponsible as to tell ones younger than them to join them in something that could potentially be dangerous, whether they're 16 or 11 they're still younger. Leon and Sonia as their elders have a sense of responsibility for them.
That is, until they showcase they're capable on their own in the situation. Once Eternatus is dealt with and the protag becomes the champion no one cares anymore if they're younger, they proved themselves as capable.