The biggest improvement for the Nats next year will be Stras two years removed from surgery and with no innings limit.
Harper for a full year in the bigs is a close second.
Assuming full health of our players, I think Ramos healthy for a full year will be the biggest improvement. Second is Zim healthy for a full year. Third is Harper a year older and for the full year and fourth is Stras for the full year. This is regular season impact.
Postseason, having Stras pitching is clearly #1 improvement.