I personally would've included Despaigne and L. Esposito in the U21 but I guess they're aiming high at the U19 and their experiences could be helpful.
L. Esposito is helpful to this team I am sure. Erika Esposito is very decent OH and a relatively all-around OH, the team just needs another OH who can pass well to play alongside Erika. Del Freo and Amoruso seems to struggle in reception often.