It will be a little ironic if Green makes it and Walding doesn't. While Walding technically outplayed Green when they were together, he also hurt Green's development by pushing him to 1B where his offense did not play as well.
Did we get frustrated with Green's injuries and make the wrong call by pushing the player with less upside? It is possible. Good for Green to keep at it and make the show. Still only 25. He might have a Darrin Ruf career in him and he has more defensive value since he can play 3B (and presumably all 4 corners eventually).