I predicted here that the prisoners would be released when it was of maximum advantage to Obama. Obama had the sailors kidnapped just before the SOTU speech to draw attention to the Iran/U.S. issue, and then had the original prisoners released a few days later.
This is all part of his 2016 victory lap, to help him pose as the best president ever.
Good for the former prisoners. The package deal is still bad for the U.S.
I am so happy for this man, God Bless him!