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You are operating under the assumption of the random surfer model, which weights all links equally. Under the reasonable surfer model, links are weighted based on the likelihood they will get clicked. Therefore, internal links pass a whole lot of that mozRank. There is also no guarantee that all 5.56 mozRank is passed in some form or another. Each link passes a portion of it, but that doesn't mean if you add them all up you will necessarily get 5.56. That's just the most you could get.