My understanding is that the new Montecristi course is the only one in the greater Manta area, so I assume that these companies are all referring to the new Montecristi development. You can find information on the course and housing development in this link.
I spoke briefly with one of the representatives of the Montecristi Golf Club at the IL event in Quito several months ago. I can tell you that he was a very nice fellow, but other than that I’m afraid I have no background information on him or others who are developing the course.