I don't think anybody knows except "maybe" Mike Bravard.

Why not look at the results from some of the RT leagues while the stats are still available and check out teams with strong defense and weak defense...good throwing catchers with pitchers with good records vs SB and with poor records vs SB...

Look at ERA allowed vs expected ERA for teams with weak defenses vs teams with strong defenses and see if there is an effect.

Then post the results here so I can find out what works. G