What is the status of a courtesy runner that has already been restricted to the dugout for the remainder of the game?

A courtesy runner that has been restricted to the dugout for the remainder of the game is officially considered out of play and cannot return to participate in the game. This rule is in place to maintain the integrity of the game and ensure that the regulations regarding player participation are followed. Once a player has been restricted in this manner, their eligibility to re-enter the game is effectively terminated, barring any unusual circumstances that would permit a change in that status, which are not common in typical gameplay.

In contrast, options suggesting the player may return to play, serve as a coach, or join the defensive team would contradict the established rules governing player substitution and participation. The restriction applies specifically to that player, ensuring no further involvement in the game once they have been designated to the dugout for the remainder of the game.