In addition to the initial shape of Isotropic kite, Dave Santos previously developed triangularly anchored concepts.
This concept was investigated on: Assessment of an Alternative Concept for a High-Altitude Wind-Power Generator (authors: Max Langbein, Maja Ruby, Nicolas Gauger), * DOI: 10.1088/1742-6596/1037/4/042023, * License CC BY 3.0.
These are essentially concepts of crosswind kite acting pulleys, while the concept I present is a drag-based kite working in pumping mode.
I thank Dave Santos for opening up the concepts of multi-anchors and isotropic shapes.