Goodwin K's a lot and doesn't have a lot of power. He isn't exactly young for his league. He is overhyped for his start in Rome when he was drafted. Not a bad prospect at all but if you are claiming him to be one of your best you are in trouble.
Cole/Gioloto are their best prospects and pitching is not an issue already for the Nats. Haren hurt them early in the year but lately he has been a stud. Nats need hitters and they have next to nothingo n the farm in terms of hitting.
Goodwin has a .164 iso slugging for a center fielder (career; .142 this year) and is 22 years old in AA. Certainly K's a lot, but is a 5 tool center fielder.
They certainly need some hitting, but the only spots that aren't taken long term are 1B and CF. THe other players in place should be long term Ramos, Rendon, Desmond, Zimerman, Harper, Werth
Internal options for 1B-3B/CF are Goodwin, Skole, Souza