1) A 4-3 vote last time...is this tribe divided or was that vote just confusion among the tribe?
It's hard to tell, I think this game is changing, I just don't know what into which is worrying. But paranoia is far from unusual.
2) With the original tribes tied at 6-6 right now, is this anyone's game again?
I don't think that the original tribes will matter at the late stages in the game, I think all tribes will be disbanded in early merge.
3) Do you think this challenge might have determined the course of this game once we hit the merge?
No, this is Survivor, anything can happen, tribes dictating everything is long gone, the game has evolved far from that. I don't know what will happen right now.