Interesting Theory About Internal Linking
I saw an article about internal linking that is interesting.
Internal Linking & SEO
The author's test site was not ranking very well initially for his targeted keyword phrase, but the rankings dramatically improved after he used internal links to the home page with variations of the targeted keyword phrases in the hyperlink text.
Most of us are probably doing the same thing with internal linking to internal pages. What makes this different is the method of internal linking to the home page. It might be worth testing.