I don't think its the quantity of back links but more quality and how close it is to the actual subject of the website.
if you link a low rank automotive help site from a high rank html forum site it would not be looked at in the way you would want it. The link is totally of subject and has nothing to do with each other.
Just a thought i really do not even want to try to understand google, Whatever they have or are doing is working.
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