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Do you think the story team initally wanted to kill the Toa Nuva off?
Them getting defeated by the Piraka, the Inika basically taking their story roles, 2008 originally having Jaller's team as protagonists again..it really seemed they wanted to do drop the original team by having a new one taking their mantle.
If the decision to awaken Mata Nui was before the one to have the Toa Nuva return, that could imply they wanted to retcon the Nuva' destiny to awaken Mata Nui and giving that honor to the Inika/Mahri, perhaps by skipping the whole Toa Ignika sacrifice plot point and Matoro being the one to awaken Mata Nui.