Plus the Mayans liked to drown their human sacrifices.
you post: “I would not be surprised at all because tiling a pool is a lot simpler than building a pyramid”
Is this referencing the Egyptian pyramids?
Central American pyramids rival those of Egypt - and there are many more of them (You probably know this, but your post isn’t clear.)
http://www.journeyidea.com/the-great-pyramid-of-cholula/