Sorry, not very clear - had to stop and coach homework. Lee in 1868 - if still in the military - would have been much as was Scott in 1861. He might have been titular Commanding General, but he for practical purposes would have been looking for some field commanders to lead whichever side he took.
Then again, he might have retired - he had a farm to manage, and a family which could have used him around the home.
OK, that makes sense.