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It's entirely possible that the rock was originally expelled from the Earth.
The amount of water on Earth is interesting when compared with the other planets.
Maybe all those water-containing comets came from Earth, rather that the water on Earth coming from comets.
The percentage of near-parabolic orbits among long period comets is much higher than it "should" be, falling in from all directions, and have perhelions concentrated near the sun (1-3 AU).
There has never been an observed case of comet having an incoming hyperbolic orbit.
This evidence would point to comets having recent origin from within the solar system.
Earth has most of the water and would be the likely source.
If some catastrophe in Earth's past could launch the comets, it could probably launch some other random rocks.
<shrug>
My guess is that scientific interpretation on any issue will be highly correlated with the motivations of the funding source.
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Waiting for the perfect moment is a fruitless endeavor.
Make a decision, and then make it the right one through your actions.
"Whoever watches the wind will not plant; whoever looks at the clouds will not reap." -Ecclesiastes 11:4 (NIV)
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