Imagine two rotating blades connected to each other, a lifter and to a tether for yo-yo. All tensile. How could those be kept at opposite ends without active control?
How could such a thing be landed?
Maybe a rod orthagonal to the lift line and the kite lines with two lines going to each kite. When the kite is too fast or too slow one of the lines has more tension than the other which coule be used to control the kites.
[edit: I’ve been stupid. Lets think about flygen or rope-drive instead of yo-yo.]