Pat G wrote: Even today, there is debate whether Zin and Primitivo are the same grape.
I don't believe there is any doubt that they are genetically the same - that was proved by Carole Meredith.
But I think Primitivo and Zinfandel have distinct clonal differences one can taste in wine made from them. I understand they have differently sized berries and ripen at different times.
The water (wine?) is muddied now because producers of Primitivo can label their wines as Zinfandel (and vice versa - but AFAIK Italian producers of Primitivo get more money in the USA for wines labelled as Zin than for Primitivo)
The wine Meredith and her husband call Tribidrag is made from Zinfandel grapes. Whether the Tribidrag clone produces a different tasting wine (which I expect it will) we'll have to wait to see when enough Tribidrag vines have been propagated.
The Vinodiversity article just repeats what is in Robinson's
Wine GrapesYou can see Carole Meredith herself talking about how she found the origins of Zin in the video here
https://youtu.be/biWXdyEyGgc