children, it's theory time
now the question is, why all this shit going on with anakin's saber?
the theory: luke never regained his green saber, it stayed on the death star where it was destroyed. so, after its destruction, luke returned to cloud city and took back the saber, also most likely destroying his hand, should he have found that as well, to prevent any cloning (because we all know how that went down in the legends universe). so, luke now leads a new jedi order with anakin's saber. young ben solo gets curious about the saber, learns of anakin, maybe goes on some sort of self-exiled pilgrimage and discovers snoke and becomes evil, returns and kills luke's padawans, thus creating the "force memento" that was imprinted onto the saber. luke then goes into exile, and gives maz kanata the saber for safekeeping (dunno why, but it just rolls like that).
so, really, the saber is what caused the force to awaken within rey, and ultimately the reason she was able to sorta instantly start doing shit.
it's a total fucking copout but it kinda works within the realm of star wars, i mean jedi academy had people instantly gaining the power of the dark side with the scepter of ragnos.
ps check out rotj when vader dies, you can clearly see luke doesn't have his green saber.