As per my discussion with @kaelig this is not about whether content should or should not be wrapped in ```<article>```'s it is about maintaining correct hierarchy within the HTML5 document outline.  

A good introductory article into the document outline algorithm and how parsers such as a search engine will understand this representation of data can be found here: http://coding.smashingmagazine.com/2011/08/16/html5-and-the-document-outlining-algorithm/