This theory is about Rey and who her father could be. First off, Skywalkers have a bad habit of looking a limb, particularly an arm, in the second movie that they appear in. Therefore, I believe that if Rey looses an arm in episode eight, she is most likely a Skywalker.
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Star Wars Theories
RandomA book of star wars theories I have thought of. May contain possible spoilers if my theory are correct. You have been warned.