It is like the “two simplest AWE ideas” described on Using an aerostat or a kite as a lifter of a regular wind turbine, by juxtaposing proven technologies?.
Minesto uses crosswind motion in the water in the same way that most AWE companies operate crosswind kites. Both crosswind kites have a far better power to mass ratio, but need sophisticated control.
For tidal turbines the question still remains unanswered. For AWES I think we have had the answer for a long time, taking into account that “crosswind flight” mode could also be extended to some rotary devices like Daisy or The Pyramid.