Just a random thought, but theoretically, should the Toa Nuva ever give up their power to become Turaga Nuva, would they produce Toa Nuva Stones rather than regular Toa Stones? Is Toa Nuva Energy different from Toa Energy, or do Toa Nuva just have enhanced elemental abilities? If so, could a Matoran becoming a Toa using a "Nuva Stone" become a Toa Nuva, as it would be charged with Toa Nuva energy?