Would average distance each year from the yearly actual do the trick? (Closest to 0 distance per year being the most accurate?)
For example: 15-21 in the last 3 seasons.
Profcat predictions: 12-24
Josh predictions: 18-18
We're both 3 off,
However:
Profcat (0+0+3)/3=1
Josh (2+2+1)/3=1.67...