I'm not sure if anyone here kept up with the development of The Legend of Zelda: Twilight Princess, but I definitely did. One thing I remember is that Nintendo was presenting a demo of the game at an E3 one year, and the developers of the game that were there seeing what they could improve on noticed something about how people were playing. Most people were holding the Wii remote in their right and the nunchuk in the left. In the game, swinging the Wii remote makes Link (the player character) swing his sword. Throughout the entire Zelda series, Link has held his sword in his left hand. What the developers actually did was to keep the Gamecube version of the game the same (keeping Link left-handed), but to mirror the game on the Wii version (making Link right-handed).
When I noticed Jim's holster being on the right, it got me thinking about something. There's a possibility (doesn't matter how small, it's a possibility) that gamesas is doing the same thing for Jim as Nintendo did for Link: making the character right-handed to match up with the way most people hold the Wii remote, in their right hand.
Just a thought...