Supose you have Javy Lopez as your starting catcher and he starts the game at 1B, then goes behind the plate in the 6th inning.
What could they do? Only count his at bats from the time he was catcher?
If you have a guy who plays more than one position in your starting lineup, then the points count regardless of what position he actually plays, and the game counts against your 162 at the position you have him in your starting lineup at, regardless of what position he actually plays in the game.
If they didn't do it that way, then guys like Ryan Freel would be worthless because you never know from day to day what position he's gonna play.
