The egg shape can also be found in Walter Russell's work, although I have never found a text where Walter Russell is mentioning the egg.
In his model of a magnet it can be seen and it can be reconstructed in his drawings
There is a difference however in the egg that can be derived from Walter Russell's work and the egg of Schauberger, see video:
Or go to the following link:
Callum Coats was not criticizing Walter Russell's work when he was stating that nature does not use spheres and cubes in her creation.
According to Callum Coats:
where he (=Walter Russell) uses these elements, he uses them in situations of “transcendentality”. In his sequence of numbers from one side of the octave to the other, namely 0-1-2-3-4-0-4-3-2-1-0 the conditions of zero values occur at both ends and in the middle, these are the positions at which he places the cube and the sphere. Zero represents the transcendental as it does also in Walter Schauberger’s theories, so there is no contradiction between the two concepts.
Source: taken from a letter from Callum Coats to Lao Russell, courtesy of the University of Science and Philosophy.