... I dont see how being heavier will be faster around corners when tire pressures can come into play and especiallywhen you bring in later braking and whatnot with a lighter rider.
basically I was responding to you saying that a heavier rider can corner faster.
....
I was a little concerned about his reasoning that the heavier rider is less affected by surface irregularities, less tire "chatter". Since the lighter rider probably uses lower pressure tires, and possibly more supple tires. Perhaps more flexible wheels depending on just how light and heavy the two riders are.
I can't offer an opinion on it though, too many variables. What I really want to do is take a 50 pound backpack and zip through a corner a few times, though even that won't account for variations in skilled technique.