Zader in arena and rancor raid after update

Many are assuming that everybody should have known about Zader performing in a way that wasn't intended, prior to purchasing his zeta upgrade. I would argue that a significant percentage of the people that purchased the zeta, don't visit there forums at all, so there would be no way for them to have known there was something wrong. Especially considering the capabilities of the most recently released characters and associated synergies. I would also argue that significantly more people have acquired only one or maybe two zetas since they were released, making them much less common than the echo chamber of these forums might suggest. This makes the decision to buy the Vader zeta much more significant. For these reasons, I think a refund would be appropriate and appreciated and changes that affect the effectiveness of something, to this degree, warrant one.