Sorry, everyone that responded so far. Should have been more clear here. We are well aware of all the factors mentioned above, however if you conduct some competitive analysis relative to all other sites in top 10, they are clearly getting beat out in all categories mentioned below by more than 1 site. More links from a higher PR and Domain and Page Authority, more exact match and phrase match anchor text, more linking root domains, more linking C block IP's, more external links, better internal links to the homepage with exact match anchor text, more highly optimized on-page elements, better social engagement, etc.
We are well aware of the general info mentioned above, but that is why it is so puzzling. If they are so clearly getting beat on many of these metrics, why in the world are they ranking at #1 vs. companies that are beating them on the metrics that matter?