What possoble benefit to Michols would fessing up be? McVeigh went silently I suspect Nichols will remain so. I have no clue at all regarding their guilt or innocense or that of anyone else. As with all the mystereous airliner downings in the late 90's this too is a mystery that will remain unsolved, but which leaves nothing but questions in the minds of most folks.
Not really.
Nichols claims to have converted to Christianity while in custody. If so, revealing what he knows would be steps toward his confession.
Also, Nichols has a son and a wife. He may want to clear his name by doing the right thing in order for his son and wife to have a better life.