It's intrinsic human nature to want more, more, more. As well as the core of forwards that Rongen has used in the U20 World Cup thus far have played (all have assists or goals), there's still curiosity about what the others can offer.
Especially when it comes to Gabe Ferrari, who plays professionally in Italy. He looked good in the pre-tournament friendly match versus Haiti, and I for one was hoping to see him in this competition even in brief appearances.
Granted, Rongen's hands have been somewhat tied - given that he had a player injured in the second match, and was clinging to a lead versus a strong team in another match. That lends itself to more defensive subs, but I'm hoping that a situation comes up before long where we get to see some new offensive skill.