You can't justify anything in the new trilogy. Sorry. I am thinking with an open mind and without any prejudice, but you fucking can't.
1) it's not made by its creator, it's just a bad fanfic
2) they nullified 6 previous movies with Rey and bringing Palpatine back
3) they destroyed the logic of lightspeed
4) this trilogy is devoid of any creativity or love behind it; it's a miserable, shameless attempt to grab as much money as you can, and run away. JJ says himself, that if you liked TFA you should question your sanity.
Although I loved the prequels since the beginning, I can understand some of the hate. But the sequels have absolutely no redeeming qualities the prequels had. Not even John Williams could salvage this shit.
And now by mere existence of it, and because of insanity of the screenwriters, who created this abomination, they will likely retroactively ruin everything, in order to justify it by connecting every single piece of upcoming Star Wars media to this garbage. We have to somehow explain, why R*y could bring back people to life, when this ability effectively nullifies the very axiom of star wars! Just let it fucking die.