What should be done with posts by removed users if the posts or the associated comments contain useful information?

Question

The example that motivated this question is this answer on this question (since not everyone can view the answer, I believe). The answer raised a point that led to a discussion in the comments, which contained points not addressed in any of the other answers.

For the sake of preservation, should answers/comment threads like this that provide useful information

1. be undeleted in their current form, so others can see them
2. edited into a separate answer, possibly a community wiki answer. I just learned about the wiki feature, so that seems like an option.
3. remain deleted per the user's request

or some other option?

Obviously in this case, I could edit the information from the comments into my answer because I'm the one who posted much of it, but I'm asking about in general if this occurs again. Furthermore, I'm likely biased towards the information in this post and its comments because I contributed the discussion; the information may not be useful for the question at all and may merit no action, which is why I present the question in general.

I noticed that this user deleted a lot of his answers long before leaving the site, so the issue may be present in other questions as well.

Answer 1

I think we can un-delete if you feel like it adds something to the site. A couple of up-votes (and a comment so I know about them) and I will do that for you no problem.

In future circumstances like this, I think they just have to be un deleted by committee like everything else.

You could also use it to generate some more points for yourself if the questions / answer are good enough to bring back. (I don't know how the discussion you linked would do that, but you are smart enough to try.)