I can see why he's generating so many strange figures and his conclusion that the going was slowing horses up by 2pts in the example he gave from Epsom had me non-plused. If anyone gets the base foundation wrong, then it doesn't matter what method you use, your rating will be flawed. I suspect the other thing that will emerge is that Mordin places much more faith in his own judgement than he should, and that he's going to wander off into realms of 'projection rating' by week 3. I personally don't trust myself, and therefore try to minimse any subjective input.
Basically a wobbly base allied with a heavy dose of subjective opinion equals a reciepe for minor chaos, and since one error in projection rating will compound others if that is then used as the errorneous base that others are assessed off, you can quickly spin out of control like a chain letter does. I'm not unconvinced that Mordin wouldn't be better served from starting afresh, as I'm sure some of his sample is badly contaminated by now