With the signing of Paul Dejong, the Nationals have a lot of options to fill out their roster. Plenty of players with notable big league experience will be fighting for jobs on the opening day roster. A big spring training could help guys force their way on the roster and lead to shocking cuts.
Right now fangraphs roster resource has the Nationals bench consisting of Riley Adams, Paul Dejong, Amed Rosario, and Alex Call. Interestingly, Jose Tena is still listed as the starting third baseman. Obviously the situation is fluid, but that is of note.