Kate's Horse is not the monster (as confirmed by producers this year)
The difference between needing Locke's body and Christian's body is simple: Being Christian would not have gotten him an audience with Jacob.
Once he was able to manipulate Locke into being the leader of the others and gain their trust, he was able to use that on Richard and Ben to get into Jacob's temple at the foot and use Ben to kill Jacob.
It was all about finding the right loophole to get to that point.
My theory is now that Jacob is dead, he needs to get all the candidate's off the island so he can leave too. If there are no remaining candidates, there is noone to hold him back. (Though I think everyone assumes this).
I think MiB is also the reasoning behind the whole getting pregnant on the island thing. I assume if people cannot get pregnant there, it was harder to produce new groups of candidates.
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