Nexus only got love from the people who played them. I hated Nexus until I played one and then Nexus was my favorite cabal and Nexus v battle was always a fun dynamic.

Battle does seem sort of pointless now, since really what cabal has an incentive to actually raid battle?
Fort, Scarab, Empire, Outlander, Entropy, none of them really care about Battle directly.

Entropy maybe, but the cabal is sparse, and the cabal does not mandate that it's members even really care about raiding or defending to begin with.

Nexus and Scion were great foils to Battle, and they meshed well in how they related to the other cabals as well. I just don't think the PB is large enough to support adding back in another two cabals. Scion was ridiculously good for powers and a scion in a smaller base would just steamroll.