This tips for make posting can easily crawled. for example you make post 3 paragraphs, strengthen keyword in paragraph one, you make different the keyword by bold text or italic... just make diferent than other words. just let paragraph second, next you focus to last paragraph. Do it the same like paragraph one. Make keyword rich. This is important : you make link of article posting to one of keywords which there are in paragraph one. You know that place the search engine crawler stay and crawled your post.
Your post is a little tough to follow, but I get the gist of what you're saying. I agree that it is a good idea to include your target keyword near the beginning and end of any article or blogpost. Getting pages crawled really has more to do with internal link structure and possibly trust factors. The strategy mentioned above is more about getting those posts ranked higher. Do that combined with building up good keyword rich backlinks and you should rank well for long tail keywords.