Whom else do you suggest to host such an organized Event of this scale. I think you need to realize Legacy/Zeno do not make all decisions regarding the Matches, the USCLB has a Staff team and there some diversity in the staff to get multiple opinions on the matter. Accusation of Macroing were only made by first Confirming with a mod over the situation. If you do not agree how the event is hosted you do need to participate in the event, and if you don't participate in USCLB I don't know what the point of being a Clan is, it would like not being part of the Clan community any longer.
This is not the first time Invincible has thrown around Accusations like this just like during Clan Wars. Maybe it should be the staff of these Events rethinking allowing Invincible to participate.