A problem when a writer gets into the alphabet soup is discerning whether he understands the metrics he's using. For example, a number of flaws have been raised regarding fielding runs above average (FRAA). Given the many things I've read about Rogers Hornsby's defense, as well as several other measures I've seen, I'd find it very hard to believe that Biggio has been a significantly worse defensive second baseman than Hornsby was. To accept this at face value, without any further investigation into what the formula measures, is shoddy anaylsis. Any exercise like this must discuss the strengths and weaknesses of the methods being used, in addition to the players to which those methods are applied.