Snapeity, Dumbledore's sacrifice

[Gopal B]

No: HPFGUIDX 149204

Hi,

'Dumbledore's sacrifice' just struck me hard on the
head. I think when Harry and DD were discussing
horcruxes, DD was willing to bet a few fingers (and
not even a hand) that Nagini was a horcrux. The
implication is that if he found Nagini alone, he will
not trade his hand for nagini's life.

Now, why would DD trade his life for Snape's cover. It
may sound like a good master strategy but is against
DD's character; sacrifice for destroying horcrux is
better than sacrifice for Snape's cover. The whole
idea of Snape killing DD could not be planned by DD
and Snape. If DD was sacrificing himself for Snape,
why did he not act similarly for many OOP I and II
members, sure he does not love Snape.

Probably, the green liquid made DD re-live his past
and he felt suicidal, hence stood defenceless against
Draco/ pleaded Snape to kill him. Maybe Snape will
regret what he did and help Harry.

LV personally went to the cave to drop a horcrux,
because DD recognizes LV's traces. was the green
liquid created by LV or RAB? If it was created by LV,
then how did it refill after RAB took the locket? 

Before drinking the liquid, DD says that LV would want
to know what person has reached this stage before
showing the horcrux. How does the liquid achieve that,
does it have a hidden brain like Diary/ sorting hat?
Or is it a dark-mark gateway?

Gopal who still thinks Snape ends up in Azkaban and DD
did not sacrifice a la Lily.