I just brought up something from experience that I felt was related to the topic being discussed. Never claimed to be an expert, either. Never said I was right or wrong or that anyone else was.
And the reason heavier people can gain and lose weight easier is because it's a smaller percentage of weight for them. A fluctuation of 10 pounds for a person 300 pounds is like a fluctuation of 5 pounds for someone who's 150 pounds.