Flynn was in total denial until Mueller presented him with FACTS. Mueller has times, dates, witnesses, and correspondence to back up the fact that Flynn perjured himself. Given the option to cooperate or share a cell with his son, he wisely took the deal. Had he not, his attorneys would have continued collecting a hefty fee for representing him even though his chances for beating Mueller's charges are slim and none. Flynn has join the others and is now singing in the key of G, Got Ya.