Board Thread:General Discussion/@comment-36186343-20200309084119/@comment-2182964-20200312021655

Didn't mention Nnoitra's case because the group he killed was never specifically said to be a tribe. The term used in the manga is "colony", which is a very different thing. Another example is Grimmjow's Fraccion. They aren't a tribe either; merely a group of Arrancar who travelled and hunted together, no different to the Hollow Nnoitra killed.