KiteKRAFT comports a lot of interesting features that were already discussed, such like high lift coefficient biplane among others.
An additional important characteristic is its recyclability. On Kitekraft - Airborne Wind Energy :
Recyclable
Our kites are mostly made of aluminum which can easily be recycled, much better than carbon or glass fiber reinforced plastics, the material conventional wind turbines are mostly made of. Leaving no burden for the future.
I think also that figure-eight is flatter than circular figure, and less subject to lead to (negative) kinetic energy towards the ground making the ascent difficult. So the weight can be less problematic during figure-eight.