What's the best way to handle a situation where you post a thorough answer, and then someone else posts an answer that basically says "What he said, but here's another relevant detail." For example, see my answer to a question, which is followed by two useful follow-ups by others which are incomplete on their own. In terms of a simple, complete reference, it could make sense to edit the main answer and add in the additional info - but then those authors wouldn't get credit/reputation for their contributions. What do you think?
If someone just wants to add in a point I suggest adding a comment on the original answer. The comment can be voted up and the original poster can make an edit reflecting the extra information (with proper attribution and link to said comment, of course.)
Edit: Answer updated to include relevant points made by Person X below