Even if the Incas were not considered IOTL a seafaring civilization, what could have happened if, for some reason, they would have invested more efforts in developing a seafaring culture in the Pacific (maybe by eventual contact with Polynesians?), arriving to New Zealand prior to the Maori settlement?
Probably the Incas would have considered New Zealand a worthy place to settle (unlike other places in Polynesia they might knew) if they could reach it. Probably the local megafauna would have suffered a similar fate, but indeed the likely arrival of the Maori sooner or later would push them into a conflict.
Another interesting scenario is that if the Spanish also conquers the Inca Empire ITTL, the Incan elites could evacuate and take shelter in New Zealand (it is unlikely that the Spanish would follow them).
Probably the Incas would have considered New Zealand a worthy place to settle (unlike other places in Polynesia they might knew) if they could reach it. Probably the local megafauna would have suffered a similar fate, but indeed the likely arrival of the Maori sooner or later would push them into a conflict.
Another interesting scenario is that if the Spanish also conquers the Inca Empire ITTL, the Incan elites could evacuate and take shelter in New Zealand (it is unlikely that the Spanish would follow them).