To date, the vast majority of available controllers utilise linear WEC models, misrepresenting the (inherently nonlinear) dynamics of devices, compromising the role of control in minimising LCoE. The small number of available techniques which consider nonlinear models, do not provide conditions for global optimality, preventing identification of the class of devices that can be considered in the current state-of-the-art, consequently limiting any results for specific application cases. Moreover, there is currently no nonlinear control framework tailored for WEC arrays, further compromising the role of state-of-the-art WEC controllers in supporting commercialisation of wave energy technology.