If one is in debt to someone, then it is only good manners to admit it. It's not as if you picked the idea up off the sidewalk or found it independently. Give credit where it's due.
You are wasting your time. The poster's actions and comments on his values, honesty, integrity,..... have been clearly highlighted on his thread about a "new" bojutsu style. Kind of like going to work and there is a slow down in front of you because people are slowing down to look at a car crash