I think that would be useful.
Of course, when the guidelines say "average" or "above average" or "good," judges need to have similar ideas of what the standard for "average" is.
Maybe showing videos of retired skaters at different levels as part of the training? But what skater wants to be used as an example of less than average? Even if they're not identified by name and the training videos are not made public.
I made a stab at doing that in this old thread
http://www.goldenskate.com/forum/showthread.php?36573-Ice-Dancing-PCS-Rules-2011-2012
since the rules haven't changed, it still has some validity. I don't know whether all the video links still exist.