Good old onii-sama setting. Well, I suppose you can't have a good teen vampire story unless everybody and their uncles are vampires - whether they know it or not. I know what you mean by a quicker pace, though. Considering all the allegations and hints of massive power play within the vampire society, we haven't really seen much, in the end. All we have is the general hierarchy and then quite a few names but before this Kaname's less than civil uncle showed up, very little actually seemed to be going on (aside from Kaname killing and drinking Shizuka's blood, which was already suggested to be a part of a bigger plan and not just a random act to get rid of her).

It'll be interesting to see what Zero's role is to be in the future. I don't think he's particularly powerful compared to the better nobles with their fancy powers, not to mention purebloods, and moreover he doesn't really have any motivations or aims of his own aside from protecting Yuuki. And since this is a shoujo show, I wouldn't put it beyond it to make Kaname and Yuuki the couple of the series - siblings or not - leaving Zero even less available role slots at all.