I guess the last 9-12 months' trickle of documents not supplied to Flynn's lawyers, contrary to an order issued some 2 1/3 years ago - documents that are exculpatory - proved compelling. Considered together those documents proved at least two things:
* Large-scale prosecutorial misconduct, concealing exculpatory evidence;
* A ~3 1/2 year conspiracy to entrap and railroad Flynn, a conspiracy that included members of the Mueller Team.
As an aside, Flynn's original lawyers should be abjectly ashamed ... or maybe investigated for possible collusion in the conspiracy against Flynn,