This is according to Jürgen Graf here. I have no way of checking the veracity of Graf's account, which is filtered through his conspiracy theories and wishful thinking; I'm simply posting the information for others to read and comment upon. Kues made the denier scene more entertaining given the "imaginative" nature of his resettlement thesis and wild hypothesizing, and at least he motivated M/G to get something out on Sobibor (no matter how dim-witted), so in that sense we will miss him, as I would expect the denier scene now to contract again into Auschwitz and not much else.
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