I would just like to add to your post that Alexander Stephens was at the Hampton Roads meeting with Lincoln. Alexander Stephens was also arrested for treason and imprisoned after the unconditional surrender. He spent five months in a prison cell in Boston Harbor. Never convicted.
Thanks.
Seems to me there were very few Confederate leaders imprisoned after the war, but I've never seen a list of who was & for how long.
My guess is Davis & Stephens spent more time in prison than anyone else.