Is Joe Mauer having the best catcher season of all time?

This questions is fairly difficult to answer for a number of reasons

1) Mauer missed a month of baseball and may only play 120 games
2) Most great catcher seasons have most likely been influenced by steroids: Piazza, Pudge, Javy Lopez, Todd Hundley(drunk)
3) Catcher defense is very hard to quantify for any given season

For this I will not evaluate the great catcher seasons of the past and focus entirely on the greatness that is Joe Mauer.

The former 2 time batting champion is currently leading the american league in average, on-base, and slugging percentage as a catcher. Batting .378 in mid-august, he has a realistic chance of touching 400. If he does end up hitting in the .390 range, we may have to consider this the best season of any player in the history of baseball.

At his current rate, Mauer would amass 33 homers, 65 XBH, 104 runs, 110 RBI and a 1:1 K/BB ratio. He has amazing plate discipline and an even greater ability to make contact given his 79% contact rate on pitches outside the zone. His career win value per pitch type shows that he destroys all pitched besides the split finger, which just so happens to be his most valuable pitch to hit this season. He is a line drive, ground ball machine who has developed opposite field power with a otherworldly 23% HR/FB rate. He is also a gold glove catcher with a great arm and averages just 3 errors per season. If it was any other player, the conventional wisdom would be assume he would regress to the MLB mean, but Mauer has proven to be a baseball freak that not even a spinal cord injury can stop.