There is an article in Das Erste in which the view that the "two Canadians were right" is attributed to Cubasch.
On Feb. 16, 2005, Das Erste included the following comment (translation courtesy of Joseph Potts):
He [Cubasch] discussed with his coworkers – and many of his professional colleagues – the objections, and sought to work them through. In this, they ran afoul of the very same difficulties on which Steve McIntyre had gotten stuck. It wasn’t easy at all to come by the data that Michael Mann had used. "That was indeed unusual." Normally, one collaborates and discusses the questions in conference. Bit by bit, it became clear also to his colleagues: the two Canadians were right. Their curve, which was was based on the data provided by Mann, looked quite different, especially in a particular respect. Between 1400 and 1600, the temperature shift was considerably higher than, for example, in the previous century. With that, the core conclusion, and that also of the IPCC 2001 Report, was completely undermined.