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Are you suggesting that TP Marty would just vanish the instant Marty-A arrives in 1955?
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Such thing never happened, so can we know for sure? I still think it
might be. Don't forget there's another idea that time travelers don't get affected. In such case it would be Marty-A who is the time traveler. So it is possible in a way.
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Plus if LP doc did disappear completely from the scene then he would never be to get arrested, so Marty would never come back to 1931 and so he wouldn't create the FCB timeline thus creating a paradox.
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Paradoxes don't always work like what we think. Since FCB is created who never built a time machine, both Marty's reason and ticket for coming back exist no more, yet there's no paradox.