Yes HikaruIzumi and MarcusCorvinus I agree this would have been stronger if it was not dragged out into a long manga. I thought the ancestress coming back was cool, but you're right that happened too fast, we should have seen Kaname with her more.
But now we see that Kaname was been working on the ancestress' plan all this time. And Yuuki and Zero are fighting side by side again which I like. I think the author is trying to undo some of the mistakes she made with the manga but it's a bit too late. I still love this manga but the whole time before she went away with Kaname and the time skip was SO much stronger and better written and plotted out, but I think she is seeing her way back with this finally and it HAS improved a lot in the last 5 chapters or so. I am really liking it again like I didn't for about a year in the middle.
For me, I'm glad I have stuck with it and still enjoy it.