In BB% I am not as worried about. The question I would ask does Suzuki call for a pitcher to make a tough pitch. If so, the BB % will go up. SO may not go up, but weakly hit ball % would. The % well hit balls would have been a good comparison, but that statistical comparison was not run. If you think it doesn't make a difference, Maddux is in the HOF with a below average k/9, but because batters couldn't make good contact he got outs. On the other hand, there are a few pitchers out of baseball right now because hitters could make good contact. In those three seasons, how many times was "other" catching the same pitcher as Suzuki against the same team. Does each pitcher on the team have the exact same K% as the other pitchers on the staff? No. Neither Oakland nor Washington would have had a static staff of pitchers. There is no proof even with the statistics that they were catching the same types of pitchers. Now, which catcher got to catch the 4/5 starter or the replacement pitcher for the injured starter more versus the 1/2 starter? If it is skewed one way or the other, the SO % for the catcher will be different. There are so many variables unaccounted for that would change the percentages. Lastly there is the significance in the difference in K% between Suzuki and "other" In 3 years the pitchers thrown to Suzuki had a K % of 18.79% versus 20.45. For every 60 batters "other" got one more strikeout. In making an assumption of league average WHIP and double plays are maintained it is not a strikeout per game unless it is a 14 inning game.