In part, this is why it says in the guidelines:

    In Submissions
    ...
    Please submit the original source. If a blog post
    reports on something they found on another site,
    submit the latter. 

http://ycombinator.com/newsguidelines.html

Your last link has now been submitted by someone as a separate item and is just so much better.

http://news.ycombinator.com/item?id=2902496