I was not claiming that. That is the thing I said I don't know: "I don't know if arctic animals are quite on the scaling line." This is a precise question about data is that has been collected. I just don't know what the data says. I'm not sure what I meant by "quite." When animals diverge from the scaling line, like primates, corvids, and dolphins, they move to parallel scaling line, not far from the main line.

Incidentally, the scaling line is not a constant brain to body mass ratio, but that the brain mass is a constant multiple of the 3/4th power of the body mass.