I've never really considered it untill now, but the blood letting ritual of the key was what activated the gate, and prophecy said it would only close when the blood flowed no more.... as it turned out, after Buffys heart stopped; after she jumped through the rift and was killed by the energy or maybe the fall (better said landing i guess.)
Do you think that could make Buffy or her father a spare key of sorts or just a means for alternate prophecy fullfillment with the whole 'Summer's blood' thing?
I'm thinking they are not spares. I understand Dawn is the key, as well as the monks made it/her mortal, gave it/her human shape, and remolded it/her in the form of Buffy's sister. I understand that her blood letting and then flowing is in essence turning the tumblers, but the Blood is what Dawn shares with Buffy and her Dad, not the whole nature of the being the key...at least if I'm understanding this right.
I'm curious if I am understanding it correctly. I always loved The Gift...not necessarily understood it for certain, but have loved it. If Summers Blood not flowing anymore acted as the seal, why did the rift close? Dawn is still alive with blood aflowing, so is their father.
I always excused it because buffy jumped into the damn thing, so maybe it recognized her blood instead of the actual key even though it was dawns blood that opened it. Maybe thats how it was suppose to be explained, or maybe I'm missing something else obvious and am totally wrong.