Feathers do very well if they are run on their own. When you mix it up with heavy competitions Feathers get lost in the vast space of the heavyweight arena. What also happens at heavyweight events is just chucking all the feathers in one round, and that makes the fight confusing and the audience doesn't get to pick a favorite. The way feathers are run on DRG events, Robochallenge events and I assume in the past XFM events are just as entertaining as heavy events are. As long as you scale everything, not just the robots.