I used curl -i | grep canon and saw a wrong tag url (and no header), but I can try again with different UA (that is a bit strange though ,) - had to re-create the posts a few times so maybe I was confused. Will update here.
True, the featured link is not for SEO but I had internally the wish to make the blog link more visible. And since it’s the same url..
(But it looks like I get a longer list of requirements, so I might need to fork the rss-poll (unfortunately it looks like most work is not done in the plug-in, though). Is the embed code also extensible?