I think you would also need sub-comments for each answer in the same style as stack exchange as otherwise people's comments on the submissions would get re-ordered away from the subject and the thread would read a bit odd.
Threading already exists (the whole "in reply to" stuff), so that would just be used to display child comments in situ.
Though to get this out the door this week... I would just ignore that for now and come back to it in the future.
@Velocio started
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I think you would also need sub-comments for each answer in the same style as stack exchange as otherwise people's comments on the submissions would get re-ordered away from the subject and the thread would read a bit odd.