If Obama's most important objective is to clear out Gitmo, it makes sense to start with the five worst prisoners.
He has dedicated his presidency to overturning everything George W. Bush did--the war in Iraq, the war in Afghanistan, the war on terror, the detention of terrorists at Guantanamo. He has accomplished the first by pulling out entirely from Iraq. He is set to pull out completely from Afghanistan and in effect to say we are no longer fighting terrorism. So Guantanamo is the biggest remaining item.
These are NOT the five worst. To Islam and Obama, they are the best. To the west, the most vile SOB’s ever bred. Champions of hell, sorrry, I mean Islam.
Consequently they are the greatest gift the ghazi in the WH can give his brethren.