Let's start with who the Dirty Thirty are. The Dirty Thirty were Bin Laden bodyguards or close associates. They were a particularly high priority and high risk. Releasing them is a mistake.
In Dec. 2001, the Pakistanis captured Qosi as he fled the Battle of Tora Bora. He was detained as part of a group dubbed the “Dirty 30” by US intelligence officials. The “Dirty 30” included other members of bin Laden’s bodyguard unit, as well as Mohammed al Qahtani, the would-be 20th hijacker.
Qoosi (who also goes by Sheikh Khubayb al Sudani) “plead guilty to charges of conspiracy and material support for terrorism before a military commission” back in 2010 but “was transferred to his home country of Sudan two years later, in July 2012.”
And he became an Al Qaeda leader. But here's another Yemeni Dirty Thirty member whom Obama just freed; Ahmed Umar Abdullah al Hikimi.
Ahmed Umar Abdullah al Hikimi was rated as posing a high risk to US interests and allies.
Detainee and other members of the Dirty 30 attended a religious institute known for extremist recruitment in Yemen and in Afghanistan. Detainee continues to demonstrate extremist behavior at JTFGTMO and is likely to reestablish his membership to al-Qaida if released.
Now we get to find out.