[JRutledge]

If coaches are going to use courtesy runners, the same runner must run for a particular position. So #6 can only run for the catcher and #5 can only run for the pitcher no matter what inning it is. But if for some reason the coach wants to bring in those runners as pinch runners, they can do that, but that means someone has to replace them as a courtesy runner at the same position.

And I also believe but need to look it up, they cannot be a pinch runner and a courtesy runner in the same inning. But I will have to check that to be sure. Going off of complete memory on that.