Mets money was all on Cespedes. The Dodgers is Hill, Turner and Jansen, right? Not really add ons. Giants was almost all on Melancon, while the Cards put $113MM into Fowler and Brett Cecil. Other than Melancon, I'm not sure those really improve the teams. I'm not saying the Nats should get a pass for not adding more bullpen pieces, but had they spent about $15MM to add Feliz and Holland, I would have said they had improved their team more through signing than these other teams.
You don't see how adding a 4+ WAR CFer improves the team?