https://blogs.fangraphs.com/top-20-prospects-washington-nationals/this isn't a 2025 ranking. It's actually a 2017 ranking of prospects in Fangraphs. It came up in an article on Eric Fedde's 2017 scouting report when he was the 3rd ranked prospect in the Nats system, with Robles the clear #1 (60) and nestled between Soto (50) and LGJr at a 45.
Only 20 prospects on that list.

IDK if they did not list 35+ as the bottom prospect is a 40. Overall, that list had a pretty high success rate, as Robles, Soto, Fedde, Luis Garcia Jr. (#4), Jesus Luzardo, Pedro Severino, Austin Voth, and Brian Goodwin all had multiple year careers, and guys like Carter Kieboom, Sheldon Neuse, Koda Glover, AJ Cole, and Andrew Stevenson had their chances in the majors. Stevenson even has a WS ring from 2019. Off the list but mentioned is Jakson Reetz, who is still kicking around the MLB fringe.
A telling observation on that list:
This system retained its best prospect despite the winter purge but is now severely depleted. The front office may be confronted with some difficult decisions this summer as they weigh their still-open competitive window with the club’s long-term future. Among signs of hope is the resurgence of a Latin American talent pipeline that was literally left for dead at one point and has now provided the system with three of its better prospects. Washington’s aggressive style of drafting has netted them injured arms who would have otherwise been selected much higher, and they’ve had success easing those pitchers back from time off. They’ll likely add another 45 FV talent to this list with their first-round pick in June, though the system is likely to take a hit ahead of the deadline as Washington chases a ring.
FWIW, with 20 prospect grade 40 or better, that compares to 2024 with 24 40s or better.