I started thinking about it a lot, and I went cross eyed.
But what I did start to think about, is that...
Brace yourself.
The relationship between Cameron/Allison and John is similar to the relationship between Kyle Reese and John.
I mean, if it's assumed that Spoiler: Kyle Reese is John's father, sent back in time by John to impregnate Sarah.
But the Cameron/Allison & John relationship is a little different. So, in 1999, John is 15, and Cameron is sent back to protect him. Now, let's just assume that the timelines stay parallel, with no one jumping from alternate futures and such. So, in the future, John Connor is the leader of the resistance, and meets a girl named Allison. Obviously, it's around twenty years later, so he probably doesn't realize that this girl looks exactly like the Cameron he knew at 15. Well, when Allison is "replaced" by Cameron, something clicks. He realizes, same with Kyle Reese, that this person, or robot, has some kind of significance.
If you remember in the great time travel tale, Bill & Ted's Excellent Adventure, they were able to change the future in almost real time, so long as they remembered to go back in time to changed things. This is a similar concept. John had to send Cameron back, because if he didn't, then she wouldn't exist.
Okay, so I've gone cross eyed. But trust me, it makes sense.
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" Besides the noble art of getting things done, there is the noble art of leaving things undone.
The wisdom of life consists in the elimination of non-essentials."
- Lin Yutang
hearts, by d.a.
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