Stubborn or stupid? Or both?

Make of this what you will:

Daisuke Matsuzaka, RHP, Red Sox - The most surprising thing was his lack of conditioning, and that he didn’t feel he had to do any of the shoulder strengthening program all Sox pitchers are on. According to a major league source, Matsuzaka appeared convinced that a Japanese shoulder is different from an American shoulder. Head-scratcher. In the end, he realized it wasn’t true. One thing the Sox have him convinced of now: He will be on the program next offseason. They may send medical or training staff to Japan, or Matsuzaka will have to make periodic trips to the US to get checked out. The Sox see a Sept. 1 return.

Two things jump out at me:

1. He actually believed that a Japanese shoulder structure is different than an American one.
2. He's out until 9/1. That's a long time.