The article mentions that there are about 150-180 left, and as to whether they are the "worst of the worst" is unknown. During a recent trial 17 out of 30-something detainees were ordered released because of a lack of evidence to keep them locked up. It is not certain whether the ones left in Guantanamo are there because the adminstration has concrete evidence of how dangerous they are (if so they would put them in a civilian court, but presumably the administration must feel it has evidence to believe some detainees might be dangerous but not enough to prove it) or because the administration is finding it difficult to find a place where to put them.
There have been examples of both of the two situations occuring.
XI Wiki



