Dude, you fucking nailed it. I will confess, despite or maybe because of how disgusting and loathsome they are, I cannot help but be somewhat fascinated with the Aryan Brotherhood.
I think its because of how creativity twisted and evil they are, as their bizarre version of Nazism is really something that could have only existed in a hopeless, war-torn wasteland. Aside form the AB being rather upfront with their intentions like you mentioned, Gutrum Vagner is also, in my opinion, the true evil counterpart to Valery Sablin, as once you get passed the obvious ideological differences both men have quite a few things in common.
They are both young warlords in their twenties that rouse to power in extraordinary circumstances, have won the hearts and minds of their followers with promises of a new utopian(for them and their followers) vision of Russia, look up to an extremely influential leader that codified a new radical ideology in the minds of the public(Hitler for Vagner, Lenin for Sablin), use the ideologies popularized by the aforementioned leaders to create a new variant of it from whole cloth and are unlikely to unify Russia unless they are player controlled.
Of course the big difference between the two is that while Sablin sincerely wants to create a better world for all Russians even at his worst, Vagner is a twisted little man who wants to transform Russia in a dystopian hellscape where the weak and vulnerable are nothing but playthings to "Aryans", he is worshiped as the second coming of Adolf Hitler and Russia joins the Unity-Pakt as an equal member of the so-called Aryan Master Race(the latter is extremely unlikely but since when has basic sense has stopped Vagner from doing anything?).