How is revelation defined here?

I thought this was a decent list but there are a few strange inclusions

Barrenetxea who’s been great but has been a La Liga player for >5 years now (started getting minutes as early as 18-19 season).

Savio who’s playing in midfield for some reason (but he has to be in here somehow).

Pepelu who was a starter for Levante in La Liga some years ago

And Riquelme who had already impressed on his loan last season

I would put Zaragoza, Cardona, and Loiodice in