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It's all Visual
To understand how the clubhead can visually cover a straight line but yet still move in a circle you need a visual aid. Take something round like a plate or hula hoop and start with it on a horizontal surface. You see it as a circle. Now, start lifting it through the inclined plane, relate to it the same as you do the incline plane when at address, and look at it. Notice what happens as the object gets closer to vertical. Finally, look directly down on it. What do you see? A straight line, essentially the diameter. But, it's still a circle. It actually begins to appear straight before it reaches vertical.
That's why 2-J-3 states that the 10-5-E plane line, that your using as a visual reference, has to be steep. The closed 10-5-E Plane line connects Impact and Low Points and the steepness gives the visual of a straight line.
You are using 10-5-E as a visual reference to cover, but still using 10-5-A as your true Geometric Plane Line.
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