Thanks, USSSA rules, I made the right callUnder most standard rule sets, courtesy runners can only be players who have not been in the game in any capacity (other than previously as a courtesy runner).
That said ...
This past year, USA Softball changed their courtesy runner rules for JO tournament pool play (when teams may bat the roster). Any player can be used as a courtesy runner.
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Also ... many tournaments implement their own rules for courtesy runners. Most often they word their own rule poorly and issues arise.
I’ll get my soapbox warmed up if anybody wants to hear my courtesy runner rant again.