I don't know who came up with that idea, but the master of the big sets (e.g. Firelord, WD and Skopio XV-1), Esben, was the designer of the piece. The geometry of the surface is exactly the same as used on the Bionicle set Gorast, but it is much better in the new version where it is used on a much clearer material. The soft wings of Gorast kind of dampened the visual effect.
Erland, Part Design