What is the extent of the contact between the Polynesians and Incas? Do they get some polynesian crops along with the chickens? Do they get pigs too? Also, does polynesian sailing tech get adopted by the incas? If so, that'll change the incans a lot. The spread of polynesian crops may cause the incas to colonise the lands to their north, and continue spreading polynesian tech in the americas.Finally, there are the Polynesians, who are going about as normal, bar only their anomalous contact with the Andean civilizations.