I agree with Azrael, the Tainted Warriors should live up to its name by being the warriors/combatants of the land of Necrovion, I'd prefer to call it Death Knights . Loyalty within the dark land is essential, progress will be seen when it is achieved. It should not replace the Sentinels for whatever reason and not just because the name of the TW implies it, and the two alliances could share the same visions and deeds, passion and dedication, and strength and brutality, do not do an unnecessary actions just because of the name.
Rituals could be held upon joining the TW and some tests of morality, loyalty, dedication, etc., I believe that is essential for the TW to progress, RP-wise and word-wise, like Knighting of the Tainted and Dark Baptismal/Blood Baptismal inside the Deathmarrow. The archives can be done, but the question is, is it really necessary for the fate of whole Necrovion? It is a very good idea, but there is already an archive for historic documents of all lands, I don't think it is necessary at all.
Since we are talking about the current thing implemented in an alliace, my idea for the ranking is:
Commander
Assailants
Because there are just two kinds of people in an alliance, a leader and a follower/student/warrior etc.
But since we all can role play, who knows, it really is dependant on the loyalty points, so if the ranking goes like General - Officer - Secretary - Warriors, and let's say the officer lost a lot of loyalty points and made its way down to the warrior ranking, it will look rather odd and make some confusions. Just my humble opinion.