What do you think about the supposed existence of a WS-13E?We know the airframe must at least be diffrerent from FC-31 v1 and v2 because it's a navalized/carrierborne variant.
But we've never had any indication that WS-19 would be ready for the prototype, so I dont' think there's any reason to entertain the question of whether WS-19 is installed in the prototype... because that idea was never a possibility to begin with.