If Nick Terry cannot name one (1) credible Jewish eyewitness to the holohoax, what does it mean?
It means that all the Jewish eyewitnesses are liars.
Even if you went without an answer until doomsday and were ignored, it would mean nothing of the sort. The credibility of eyewitnesses to Nazi mass murder doesn't depend on whether one poster responds to your very silly question/challenge.
It also doesn't depend on whether there is a "best witness", or a best Jewish witness, for a number of reasons which ought to be obvious to everyone, but which have apparently eluded you.
Firstly, you asked for an eyewitness "to the holohoax", which sane people would translate as the Holocaust. Sane people's understanding of the Holocaust includes mass extermination by shooting, deaths in ghettos, labour camps and concentration camps, deaths in transit en route to the camps, shootings on arrival at places like Treblinka, and gassings at Chelmno, Belzec, Sobibor, Treblinka, Auschwitz, Majdanek, Semlin and Maly Trostinets along with many other places. By definition there cannot be
one witness to all these sites.
Secondly, the events were not only witnessed by Jews, but by Germans, Poles, Ukrainians and other nationalities. In a number of cases we don't
have any Jewish eyewitnesses to these killings because they, er, died. Where there are Jewish survivors, we can often contrast their perspectives and vantage points with the perspectives and observations of non-Jews.
Thirdly, the events were also documented more than chimp deniers seem to realise, which further corroborates the eyewitness testimonies.
Finally, there are rather a lot of eyewitnesses to Nazi mass murder. I know of more than 300 for the Reinhard camps, of whom more than 100 were Jewish survivors. Their credibility can only be assessed collectively, not individually, in parallel, not in series. The number of witnesses to Auschwitz is in the low tens of thousands.
But you know, keep blethering about Mueller and Zisblatt and Wiernik, it sure makes you look well informed and knowledgeable.