I know and until proven different it is the reasonable explanation. But there is no law that prevents life from appearing in several places on a "cinderella" planet, which by its very hospitability invites diversity. Hazen explains the "bottleneck" in the occurrence of rare events among the common. "The greatest mass in a Redwood Forest consist of trees, but it is the rare mosses, ferns, slugs, bacteria which make up the diversity."
Cephalopods and primates share a common ancestor about 560 million years ago. That's about 3 billion years of common ancestor, or about 85% of the age of life on Earth.
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There is no law preventing life from appearing in several places - but there is a law preventing two independent cradles of life finding the same solution and continuing on perfectly independent paths for 3 billion years while remaining identical. It's called the Law of That Would be Ridiculous. Let's be clear: humans and octopi came from the same evolutionary ancestor.
