Cordero is a good closer with a strong track record. He is one of the lowest risk closers in terms of potential to lose his job, even if he continues to perform so-so.
That said, I woudl not be rushing to get him on my team. He is the only decent trading chip the Nats have, and I really cannot envision a scenario where he does not get moved to a contender by the end of July. This could be great if he lands in the right situation, but it is also quite possible that he will be traded somewhere to do 8th inning work, destroying his value completely.