Actually, that's not true. Google very much knows that the site is a video site without a sitemap. It is able to do that based on object codes. What happens is that when Google scans the sites, it is able to detect the video codes and the links to the FLVs (for those people who do not hide it). It then knows that the site is a video site. The video sitemap helps provide Google with the meta data for each page and each video.
Pagerank very much affects indexing. It doesn't effect the process of indexing, itself. What it does is it affects what gets and stays indexed. Since a portion of the pagerank formula is relevance, a site that contains content deemed not as relevant by Google may find itself removed from the index. This is very much true for sites in which its only content is video (which is why video sites are hard to SEO). While your site may provide meta data, the real content isn't text, it's video. So, Google has to determine how popular a video is based upon direct links into that video. If it finds that people are directly going to a page, it may or may not keep the site indexed. It isn't until the page's rank increases in that it has a better shot of being included in the index. This is also why sites with zero ranking have more of their site index than pages with ranks between 1-5. It's because Google has done it's analysis and retains what is relevant to what people are looking at with regards to your site. With sites with zero ranking, it doesn't know this yet.
No one said anything about non-video sitemaps so I do not know what you are talking about there.
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