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Are you really asserting that you have 10's of millions of years for those things to fly around in the harsh environment of space while remaining capable of initiating life on earth. And you still have the entry into earth's atmosphere to deal with.
I'm not asserting anything, because I really don't know. I'm just saying I think there's more room for plausibility than you seem to be giving it.
Evidence of water has already been found on Mars. If a collision caused a large chunk of the planet to be jettisoned into the cold vacuum of space, it's reasonable to think molecules that were deep within such a chunk would remain frozen for quite a long time. As for re-entry into earth's atmosphere, we know that chunks of meteorites survive, because we've found them!
Are you aware that many scientists now think most of the water on earth originally came from meteors in the first place? Again, I am not asserting anything. Just saying I don't think it's impossible. And anything that's not impossible is bound to happen sooner or later over an infinite period of time. 14 billion years isn't infinite, but it's long enough for some very improbable things to happen. Ditto for even a few or couple of billion years.