I totally agree about the stuffed toy or the puppy. Transforming the Key into a sister for the Slayer was stupid and unnecessary on he tmonks' part. Its only actual purpose was to introduce a new, younger, member into the cast who would have a close bond with the existing group, basically the same reason that Chekhov with his god awful Beatle wig, was introduced on "Star Trek."
And what example, one way or the other, do we have that Buffy still has that sort of protective devotion to Dawn in Season 6 and beyond? Nothing in Season 6, but in Season 7, she tells Giles that, under similar circumstances at that time, she would, indeed, have sacrificed Dawn to save the world. Buffy doesn't have to quit loving Dawn entirely just because she no longer placed her life on a higher priority than that of everyone else in the world.
Why didn't the monks create the same feelings of protectiveness to Riley and Spike? For that matter, why didn't they do the same thing to all of the Scoobies, and maybe a few hundred other people, creating an army of Dawn protectors? Could it just possibly be because all that they knew about the Slayer was general knowledge about the "one girl in all the world" whose duty it was to protect mankind from all the vampires, demons, and assorted baddies? Even if they had thought of anything like that, it'ss doubtful that they had sufficient time to do an in depth study of this particular Slayer and all of her friends and allies. From what we saw, they were kind of rushed just to accomplish what they did before Glory found them.
And as for the cast of "Star Trek," I liked Kirk too, and Deforrest Kelly was a fellow Georgia boy, so he had a special place in my heart as well, but Spike was by far the most unique and interesting person onboard the original "Enterprise."
And Faith didn't kick Spike's ass.That was some other Vulcan, who didn't look anything like Spock, and, if you check his rank insignia, it clearly shows that he is a Lieutenant Commander, whereas Spike was a full Commander. (McCoy and Scott were Lieutenant Commanders, Uhura was a Lieutenant, Riley was a Lieutenant, Junior Grade, and Chekov was an Ensign, by the way)