The problem is that we know less about the Spirit/Nova cats in Clan Protectorate that arose about fifteen years ago than about mini factions that appeared in the "Tamar rising".
I think the issue is the presumption that we do know about the Spirit Cats/Nova Cats in the Protectorate and so doing a write up on them probably seems redundant. They're covered in several Dark Age novels. They've got character creation rules in the Era Report.
The Protectorate Guardians have a write up in the Era Report, Beta Strike Cluster gets a write up in Empire Alone, the Protectorate Military gets a write up in the Field Manual, Shiva, Purifiers and Omicron as well as the Spirit Cats in general get a write up in Era Digest Dark Ages. They get page 37 of Shattered Fortress as far as what they've been up to.
I'm not disagreeing with you. I'm just saying I think the writers probably just don't think they need to be explicit about the Clan Protectorate because they actually get a lot of attention in the books. Especially if you're doing something like Empires Alone. Do you use your page and word count to expand your information about someone with very little information? Because with the Spirit Cats you're essentially duplicating information.