Yes, thank you very much for this detailed information. I was just technically interested why it works for one plugin and why not for another. Plus it sounded like the way Wordbooker does it makes the page load much slower as it needs to be. In my eyes a fast page is more important than og:image tags, which are used, but not used very often. So I would rate the speed over these tags.
Also on my site I use a special way to get the content onto the complete rendered webpage in the browser. Which has nothing to do with the standard way most WordPress do it with filling the content area of a page/article in the WP backend. So for sure WP SEO works in most of the cases just fine.
Thanks again for explaining this.
And maybe in the future there will be changes in WP SEO which allow also getting "my" images. But I can wait on this. ;-)