Edge Loop - why is top edge different from step edge?

In Section 2 Lecture 29 at 2:04 you explain that the top step does not work like any other step in that selecting the top step edge and using edge loop will not circle about on the same plane and pick up all the co-planar connected edges. However, on all the other step edges the edge loop command does pick up all the other co-planar edges. It also works on the step vertical ends in that the edge loop will pick up all the vertically connected co-planar edges for all the other steps, even if starting from the top step. You mention the pole stop which you identify as two edges normal to an endpoint prevents the edge loop function from selecting more edges but every single endpoint in this pyramid has at least two normal connecting edges. So why is the edge picked out at time mark 2:04 different?

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