As far as a Nixon type pardon. There is a question if that was even legal or constitutional. If Obama tries it then I think that this time it will be challenged. Of course with the current crew in the supreme court.....
If Obama pre-pardons Hillary, I do think we need to reexamine that policy. It isn’t kosher. A president could prepardon ALL of his friends.
According to Steve Steve Pieczenik, multi-agency LEO’s are setting things in place to prevent a pardon.
https://www.youtube.com/watch?v=ov5kvWSz5LM