It's like which came first ..Chicken or Egg, LuXun is un-reboundable(heyshell has done a tremendous job translating the skill from Chinese ) whereas GJia rebounds 100%. There is the contradiction. They should have thought of it better.
I can accept modification of LuXun skill to mention : "Ignores rebound skill "
Analogy would be the "ignore defence" skills we see in many rpg's.