Is the following referencing the two brothers you had spoken of?
"… the site of Nan Dowas, the royal mortuary, where they calculate the weight of one of the basalt stone blocks at around 54 tons. According to local oral history, the stones were flown into place by strange visitors using levitation. The twin sorcerers who created Nan Madol are said to be of giant proportions, similar to the legends of Easter Island."
You had said:
"To Pohnpei they came. Two brothers with red hair blazing in the sun. Leaders of the Tall Ones were they, who brought with them others of the tall Shining Ones. The small people called them the Mapmakers. This was 900 years ago by your counting."
They were of giant proportions, yes (12′ tall) — not as big as the Easter Island statues.
The statues were later used to guide the Shining Ones back to Easter island, so they made them tall and hoped they would be visible to the gods' ships, as they sailed by.
But initially they were supposed to be placed along the coastline, to stand for generations to come, as indicators of where there were freshwater springs at the bottom of the ocean. The springs created 'pools' of freshwater in the salty sea. The island could not support life otherwise, because it wouldn't have enough fresh water (unless the people knew where these freshwater springs were).