I guess if they get some good prospects, it could turn out well... but the marginal gain of adding a second closer isn't nearly as high as the marginal gain of adding another player they need (such as a SP). This of course is based on them keeping the players they sign... it'll be interesting to see what prospects they get, and how much it will cost them. When teams pull unorthodox moves like this, there is usually a reason that they are unorthodox. Maybe they're innovators like Beane, who knows. They could be starting a trend of signing 2 closers and trading one or both at the deadline.
"Jack, will you call me, if you're able?"
"I've got your phone number written, in the back of my Bible."