Yes, clearly imo. Not that Rovella and particularly Fagioli may not become better, but Frattesi is already very good, like Barella at Cagliari before his big move to Inter. He combines great runs with the ball with good vision for passing, great player to break the lines with both energy and skill, not one or the other like it usually goes. Like Marchisio. He always puts in good numbers for goals and assists for a midfielder that generally hasn't played in AM or forward positions.
Another player that goes through Roma's great youth setup that goes wasted for Roma.