I recently found this: Is it possible to convert audio to midi with the shell?
As you can see, the person actually leading to the answer used the comments section to provide his answer instead of posting an actual answer post.
The person who asked the question then added an answer based on what the other person had written in the comments and accepted his own answer.
Now, this would seem like "reputation theft", but here's a different issue: the person that answered in the comments seems like he isn't active anymore. The answer was given eight months ago, and the user hasn't received any more rep. since. On the other hand, that user seems to be quite active on askubuntu.com.
I'm unsure how to deal with things like that. Should it be transferred to the community wiki or something? Should I flag this question and/or answer in any way?