https://www.washingtonpost.com/sports/2020/11/19/nationals-position-player-prospects/from an article by Jesse Dougherty interviewing Mark Scialabba on Nats position prospects. After discussing Antuna, Pineda, Cuff, and Mendoza:
The same goes for Marte, De La Rosa and Quintana, except the Nationals typically move outfielders faster. That depends, of course, on how these three progress in the next few years. Scialabba noted Marte’s speed and arm. With De La Rosa, a prospect Scialabba first pointed to in the spring of 2019, the club sees athleticism and a developing left-handed bat. And with Quintana, the youngest player Scialabba named, the Nationals heard the right noises off his bat this fall.
Remember, Scialabba prefaced this all by calling Antuna, Cluff, Mendoza and Pineda “A-ball type players.” That means they’re not quite on the major league doorstep. That means De La Rosa, Marte and Quintana are a step or two behind that. But it’s never too early to project.