I'm not sure if Luna will start often, but there is always room for him on the 18 IMO, we dont really have another player like him. Not sure he can be played the full 90 yet, but he is the type of player that benefits from playing the full 90 just due to the opportunity to impact the game more.
Honestly, kind of the same thing about Reyna right now. Unique talents and skillset, but not sure he can play a total game yet and not quite at the point where his offensive impact can outweigh that gap. But you always bring him becuase you can sub him in and KNOW he will make his mark (at the national level, lol)
Both players very young, and can still develop the weaknesses in their game to at least be average