Black Hats Prepare To Spam Google's Author Authority Algorithm

For the past six-months, Google has been working on an algorithm to promote authorities on topics.In short, Google is going to try to figure out which authors or individuals are authorities on a specific topic and promote their content across any site, in some way. You can read more about it in the links above.
This morning, I spotted a thread at Black Hat World where "black hats" are seeking ways to exploit this algorithm by "faking" author authority.
This is how one explained it:

So Google now allows you to "tag" an author in your content. Good authors who are popular get extra ranking bonuses for their articles.So it seems very simple to me. Find a popular author in your niche, and tag him in your links to your content.
Extra link juice off someone else's work.

Google: Sitemaps Do Not Guarantee Indexing

This is likely obvious to most the readers here but it is simple, submitting an XML sitemap to Google does not mean the pages in that sitemap will be fully indexed.A Google Webmaster Help thread has Google's Gary Illyes responding to a question about why a site that has submitted 40,000 pages only has 100 pages indexed in Google.
For example, here are two sites that have submitted their URLs to Google via an XML sitemap file. One, has submitted 17,987 pages and Google has actually index all of them, plus one. :) The other has submitted over 7 million pages, but Google has only indexed about 4 million of them, which is about 53% of the pages submitted.
Why did Google index all the pages on one site but only about half on this other site? Why did Google only index 100 pages of the 40,000 of the site complaining above?