Tiny test case:
- We place 20 high PR blog posts only using branded and url anchors, result: main keyword isn't moving a single spot
- 1.5 month later we place 10 high PR blog posts using the exact money anchor, result: the keyword moves from #6 to #1 within about 2 weeks.
Second test case:
- again 20 high PR post with branded/url anchors and keyword stays stuck at #9
- 1.5 month later, 10 high PR blog post with one exact money anchor again and poof, within 4 weeks the keyword ranks at #3