Sorry, I hoped the
would indicate that I wasn't targeting you directly.
Also, I think most of those players would end up just not using a shield special, specifically because it requires being defensive. Add to this that Zelda, Ness, Lucas, Lucario, Ike, and Marth already have defensive moves and really don't need another.
You want to focus on defense, I want to focus on mobility. Neither move has to be unique to each character, but I think adding both could add a substantial amount of depth to the game.