i'll be so very highly disapointed if she misses the core of this story: peace! not manslaughter peace, true peace! the whole deal was to have peace and coexistance between the vampire and the humans!
I agree with everything that you wrote; concerning the plot what i got until now is the following:
Hino intends to bring co-existence or with better words coexistence shall be achieved with all the pureblood race vanishing from the face of earth (if I just take all that is done and written by now with no further) analysis.
So under this view some questions of the plot can be answered:
1. Why Kaname was watching Hana?
because he wanted to see if he is in slumber and how long it would take him to awake. So making a move against any pureblood would not have any meaning since Hanadagi could not be killed, and as long as purebloods were around, he had to be around too.
2. Why does he let Sara to kill Hanadagi or does not face her earlier?
So that he can get access to Hana's castle and kill Hana of course (one less to go).
3. Why does he leave Touma alive?
So to be in HA the time that he shall replace the hooded-woman and can transfer messages or plot further with the rest of the purebloods so that they can organize a final attack against him so that they are eliminated all together.
4. Why does he visit Isaya?
All the pureblood race has to go, Isaya had no interest in his life so Kaname correctly had the idea that he can change Yuuki to human. That would also end Isaya but by his own choice and with Yuuki human and Kaname as the metal there would be no purebloods left.
5. So he visist the HA?
Apparently to wake up the ancestor with the presence of the purebloods and replace her in order to make himself a bait for the purebloods that would see the opportunity to seek the his elimination after that. Also to give himself a meaningful ending with the weapons and liberating HW to close the circle.
6. Why did he choose to kill the rest of purebloods now?
Apparently since there were few left, as Yuuki says when counting the families and because he had promised to make a safer world for her. He felt that as his duty, a legacy that HW had placed upon his shoulders 10.000 years ago.
7. Why didn't he eliminate purebloods before and during these 10.000?
I guess because since there were good purebloods and he even had a familly, he could not finalize the race/ there was no way. Now all the good purebloods are dead, Yuuki shall be human, Isaya shall die to make her human and Kaname shall give his life to the weapons.
With no purebloods left around (even good ones) to influence the nobles and the rest of the vampires, the vampire society can be safer and better controlled from the hunters. So this shall bring coexistence or at least set far more foundation so that the relationships of the races are healthier in the future.
And my question here is; is that the final clue of VK? that a race has to vanish from history (purebloods) so that peace can arrive?
Who can believe in such a peace or co-existence?
Let me express it another way; if Kaname stayed home and purebloods made a show then apparently the bad ones would be dealt naturally along the way, either by Kaname or with the aid of the hunters and apparently there would be no need for further sacrifices, yuuki turned to human or replacement of the weapons.
So what was the point of the second arc all together?