Sprint power... C = B = A
Weight............. C=>B=>A
With the weight thing - yeah on average that's probably right I think, but its a bit more complicated and not always the case.
For example the top 3 in our race were heavier than in yours. The guy who won our race was 103.6kg, and the next two were 88kg and 90kg, vs the top 3 in your Cat C race who were 79kg, 89kg and 86kg respectively.