Kaname himself actually refers to Rido as a person who embodies his faults well/says they're very much alike/is a very good mirror/etc. That wasn't something I just pulled out of thin air for the sake of arguing my point. Also, whether it's a chunk or the whole thing, Yuuki saying she can't be sated by Kaname because of Zero still has very negative implications for Yume, because you're supposed to be sated by the one you love. If Yuuki loves Kaname, she should be sated by him, but she's not. Thus my point of her feelings for Zero at least being equal to Kaname, if not greater, and also Yuuki saying she's with Kaname because she doesn't want to be alone for eternity. Not because she loves him. And, his feelings make her sad, not happy o_O But I was just stating my opinion before, so I digress :P We'll all think what we want until Hino proves us without a doubt wrong. (Oh, and I like Kaname's character - not sure if you thought I didn't with what you said in your post lol but yeah. I find him interesting now that we've learned about his past as the Ancestor, and I think it's very sad what he went through)
I was actually wondering about Rima and Shiki myself, because they were going to the association after Takuma and I'm not sure how he managed to get past them while carrying Sara. XD I guess the next time we see Takuma, we'll probably see Rima and Shiki as well. Maybe they're following him? I think Takuma has probably returned to Kaname's side for now, since Kaname isn't the one who killed Sara. I was surprised Kaname left Seiren behind, though. Not that he had much of a chance to go get her, he was making a quick get away, but I wonder if she'll stay at Cross Academy now or if she'll disappear and go to where he is? They have a master/servant type relationship it seems, she's very loyal to him, so I can't imagine her not trying to track him down.
I think since Kaname made the choice to not turn Yuuki back into a human like he'd originally intended, he probably decided to give her a new role: watching over the vampires and being the one to take his life. That's not to say this is what will happen, I just think that's what Kaname may want.