O.K., that's the way for me to implement it. Fine.
How can Google (the spider) now realize a pyramid, which it couldn't without HTML5-tags? To be honest I still don't understand where the clear hint for Google is accomplished that says "this is a pyramid with a teaser because it is a comprehensive chapter and the author knows how to write it userfriendly and webfriendly". Just using section and article tags don't manage this, do they?
Smart and correct thoughts, yes, hm....
Four things are sure:
1. I will need both, just bolding visually and semantic emphasizing.
2. Both should be discerned consistently.
3. I want to make it correct, in terms of HTML5, for the user, for Google. No SEO-overoptimazation, tricks or manipulation.
4. Google gives a little weight to all of the mentioned tags, bold as well as em, strong... I don't have to be worried about not enough SEO effects.
So, as far as I understand, the only thing which might be tricky is using a certain tag for the teaser and AGAIN using it for example to highlight a KW or phrase. Whatever tag I use for the teaser, it better should be used ONLY for the the teaser, right?
Btw, some people say using <b> is always bad "spaghetti code" because visual effects must be managed by CSS exclusivly.