This is very concerning specifically for EU players. I don't know what numbers the devs are looking at, but practically, Chaos DC PF has been... less than stellar. Much fewer parties that JP or even NA players would see on their PFs, much worse success. Pugging on EU is a nightmare. It honestly doens't feel like the practical pool of EU endgame players is big at all. By making this split, the risk of PF dying out even more is very high. While it isn't impossible that population will eventually even itself out, it's just as likely that all the skilled and networked players would agree to join together on Chaos, leaving Light in the dust, or vice versa. I understand that this is being done to avoid another situation like Raubahn bottleneck at 4.0 launch, but I don't think long-lasting implications are being properly considered.