The picture in the middle is Ahu Vai Uri, compare the stonework of it to the image of Ahu Vinapu, on the southern shore near Rano Kau. In the detail shot you can see the incredible precision in the stone fittings. It was this precision, so similar to the stonework done by the Incas, that gave Thor Heyerdahl the idea that the Easter Islanders had come from South America in reed boats on the prevailing currents. Stonework of this complexity had not been seen in Polynesia, but it was common in Peru. It's impossible to look at that site and not think of the exact type of stone fitting which is so common in sites like Machu Picchu.
Most archaeologists consider the similarities a coincidence.
If so it is a remarkable one. Soon ahu with erected moai were installed on all corners of the island. Over one thousand moai had been carved. For years the competition to build the biggest and the best Moai went on. The population of the island continued to grow.