There is no way a player can train for the explosive actions without putting in some serious (supervised) training, and missionaries just don’t have time for that. Covey will probably lose some of his explosiveness and direction changing abilities.
A missionary in my mission played basketball for a school in the Midwest, I think a Big Ten school. He used to do box jumps and other plyo exercises, along with weight training. But even that isn’t the same thing as training with proper equipment and proper periodization.