First of all about LIZZY, there's really no need to get too hung up on that point on the supporting documentation, maybe Skylar did it for her, or maybe it was the two women who slept with Brad? Also you are right, but I still maintain my opinion on the lizzy issue.
As for Darci, I think maybe you missed my point.
We should split the timeline into 3
1, present, 18 year old MC, Darci, and classmates
2, Future, shit ninja, mystic , and maybe Ms. Gilmore?
3, past, the moms of the classmates
Along those lines.
2 has been through what 1 is going through now, and went back in time and maybe changed things.
1 is now experiencing, what 2 once experienced, and goes back in time to set time back to what it was.
Some 3 is aware of 1's existence because of 2's influence, and helps, or prevents 1 from carrying out the task.
If this is true, then one can speculate like this
shit ninja=2 darci, mystic=2 MC