Fungo:
I think, actually, you misread "where I am going with this."
It has nothing to do with explaining stolen bases, or trying to promote my son by explaining inequities in the rules. I am curious about whether scouts and coaches have any finer tools to evaluate catchers' catch and throw skills beyond the woefully inadequate PB's and CS%.
Other positions have measures that are pretty darn objective and meaningful.
You say "the worth of a catcher is in the eye of the beholder" which would confirm what I was saying - the stats are pretty meaningless and so someone has to watch a catcher over several games to get a basis for evaluation that is available for some other positions just from the statistics available.
Obviously there is no set of statistics for any position that gives anyone the sum total of information that is necessary to make a judgement about a player.
But I'm suggesting that for the catching position the available stats are less illuminating than other positions, and wondering if anyone has come up with anything different.