2d elemental depiction flawed

[Iscah]

The Eureka wheel is flipped so that the two rock-paper-scissors triangles rotate in the same direction, whereas they go in opposite directions in the original circle but there's also a separate logic for the six circle elements to progress in order.

As for the rest of your theory...

If we think in 3D and look at the 6 elements as points you get the shape of a "D8"{ 8 side dice.}
interestingly enough 6 + 8 = 14 {also the number the shards and source equaled after the sundering}
Importantly it has a correlation the Convocation of Fourteen

The elemental wheel "in 3D" would not be an octahedron with six points and a square cross-section. The six elements ARE a circle (or hexagon) on a flat plane, and to render it in 3D would be an irregular twelve-sided object or double-cone with the flat ring of elements in the centre and astral and umbral points "above and below" the centre of the wheel.

Eight is the total number of elements and forces, but then you can't count the six elements separately and add the number to itself.

The grouping of the astral and umbral elements seems to be, as rendered in the background of the illustration, nothing to do with the light/dark or active/passive divide but simply sky and earth – wind, fire and lightning as "airy" elements and ice, water and earth itself being "grounded".