Peterson’s original plantings that were used to select his pawpaws are gone as far as I have been told. The land was repurposed I believe.
KSU has a decent selection. It’s not just named cultivars it’s also the existence of current breeding material. Blake has posted about this too. I know Neal has posted about this as well, but I do not recall his specific post. I think there was some discussion about selling off the land, which why there was concern. At the present time as far as cultivars go, Cliff probably has the largest selection in existence (at a single location). Next would be Ron and maybe Ken or Blake.
I have not looked at the raw CSV data, but I don’t think there is a need to rehash that. I do understand the points you make, particularly with Fisher and Nei (you have good points, but there are limitations too as you pointed out), and I simply believe this will be resolved via future citations if and when new findings are presented, whether they are yours or someone else’s. Moreover, I think to some extent we are talking past each other since you’re focused on analysis and I’m more concerned with the data generation and processes.