Yes your explanation is correct.
I can only see Blog Default Description and Homepagea Meta Description in the SEO Plugin Meta Description area of the plugin.
The only reason i’m asking is because it works and shows ALL current pages in that area on the other sites i have it installed on.
I’m an aggressive, very active SEO consultant and i try to manage it all globally from that area so i can see the entire site’s pages and descriptions at once. I’m real careful on weighting and balancing.
Any insight is helpful.