About the purple-pulped mamey-sapote, I thought it was too dark to be attractive, and not particularly good eating. It was just a botanical oddity. I failed to add that observation to my notes at the time, so now don't know which variety it was.
As to what happened to some of those varieties, I don't know, as I have not been to the evaluation plots for the last 11 years.
'Lorito': Seaon in Yucatán is Dec-Feb, which is very early and long. Small- and medium-sized fruits, very red flesh, creamy texture with no fiber or grit, excellent flavor.
'Marín': Season in Yucatán is Feb-Mar, which is early to mid. Large long fruits, standout-red flesh, firm-creamy texture with little fiber, excellent flavor.
Of the 25 selections he had made from the surrounding area, this was Eduardo Marín's favorite. He started out calling it 'Nuevas.'
'Felipe Mayo': One of five selections Marín made on farm of Felipe Dominguez. Season in Yucatán is May, late. As late season mamey-sapotes there are usually wormy, this variety's claim to faim is that it is worm-free, due to its exceptionally tough skin.