I'm not really interested in the comparison to Elia, but I'll have to try and sell Estigarribia instead.
Overall, I think he has been fine. He's had decent games against Genoa, Napoli (twice), Roma (twice). The Parma and Milan games were bad for him, admittedly, but he's done fine for someone without consistent game time. Usually it takes players a while to properly adapt to a new (tougher) league when they are a guaranteed starter, Esti isn't even that at Juve.
He's cheap to keep (€0.5m a year wages and a small buyout clause), he doesn't complain and gets on with his job and works hard. 24 years old so some room for a bit more growth. You can't really ask for much more from a squad player can you?