Doing that he will never be in shape for the playoffs, besides he is not that old for a point guard 31 years still is young
Duncan is not an old piece he is not in `11 shape because his shots are worst right now you cant say he is done.
Leonard should play more minutes but I guess they wanna keep his knees fresh, Kawhi should be more aggressive in offense every time he can, I guess he doesnt want to attack the basket every time to not disrespect Duncan or Parker but he is not a pussy every time he feels to make a monster slam he simply does.