It does seem an FAQ would be a good thing here (or a new codex)
Although it RAW, it does seem silly that most daemons don't obey the GK anti-daemon rules. Its like saying anyone not called Mary, Anna or Sue isn't a female. Or my house isn't a house because it doesn't have a house number.
But a 5ed codex with competative GKs, I would pickup without hesitation. The idea of of playing the super-elite of the super-elite appeals, its unfortunate it does not seem that way on the table.