Good keyword linking = good SERP results, and;
Good linking = high PR;
Therefore, high PR = good SERP results.
Doesn’t follow.
Good keyword linking = good SERP results – true
Good linking to other sites = high PR – true
high PR = good SERP results – not true
I have had several sites with PR= 0 and links= 0 have first place in all the keywords of my choice. They are now up to PR 4 , still have the SERP, and still have no links at all except outgoing.
Under the circumstances, I will just leave it that way.