Posey, only about fifteen months removed from a horrific injury which caused him to miss most of 2011, is hitting .329/.394/.541 for an OPS+ of 167. It is unlikely he can continue that pace, but he will not need to do that to accumulate 1.6 more WAR and break Breshnahan’s record. Posey is likely to record the greatest season ever by a Giants catcher, to some degree because catcher has been a weak position for the Giants throughout most of their history. Posey is, despite that context, still having a great season for a catcher. If he continues at this pace, he will have 6.6 WAR by the end of the season, good enough for a tie for 17th best season for a catcher and eighth best ever for a catcher under 26 years old.
Cabrera’s career, to be sure has been an odd one. Before 2010, he had established himself as a useful, if not quite good, outfielder: a valuable fourth outfielder on a good team or a passable starter on a bad team. In 2010, however, he was terrible, hitting .255/.317/.354 for the Braves. The Kansas City Royals took a chance on Cabrera; and the outfielder had a career year in 2012, hitting .309/.335/.470, numbers he is on track to easily exceed this year.
A more interesting question about Thomas’s career is how he ranks among the greatest right handed hitters ever. There are some players who were right handed hitters who were more valuable because of the positions they played and their ability to contribute defensively such as Willie Mays, Mike Schmidt and Honus Wagner, but when looking at batting numbers only, there are fewer right handed hitters who were clearly better than Thomas. Thomas is one of only eight right handed hitters to have over 9,000 plate appearances and an OPS+ of 150 or better, and one of only four with 10,000 or more plate appearances and an OPS+ of 150 or better