Nats need two starting pitchers and a shortstop. If they can sign Correa, I don't care if the guy denies Houston cheated. Not as long as he hits and plays SS. Pitchers? A good one as number two starter and a respectable pitcher for number 3. Then Fedde and Espino until one of the prospects shows up. No hoping for miracles from Strasburg or Corbin.
Alcides and a utility guy, of the sort that Rizzo can find, to back up the infield.
CF and LF will be shaky. Maybe Thomas can hit respectably, or maybe he's a good 4th OF. Before anyone talks about AAAA OFs, we know, and need to face the fact that Robles is a AAA CF until he proves he's a major leaguer. Yadiel seems to hit, and he would be OK in left. Of course, Schwarber was a good recovery, but can Rizzo sign him again? Or someone like him.
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Not a super-team, but the Nats could compete in the NL East.