My rationale is that if the distribution starts at 530-690 it would be symmetric, with median of ~610 as you said, I just think based on the trends, the lower bound can be eliminated at this point, whereas there is still enough uncertainty about it's post holiday run as to not rule out the upper bound, not to mention the lack of competition in January pushing the potential for an outlier overperformance, thus leading me to a 570-700m range that's skewed right