It looks like 2 accusers." No, I believe #2 was some sort of low-level program manager functionary at the NRA (although #1 "Karen Krushwhore" was the $35K severance and #2 was the $45K severance).
#3 and #4 are almost certainly one-in-the-same Sharin' Buyalick.
And as you pointed out, #5 is a nothingburger.
Now here’s one that just defies reality: If, as I suggested in another thread, someone used the FOIA to procure that Cain’s supposed Two-Buck Chuck $800 dinner tab from USAID, the request would go to OIG — WHERE KAREN KRUSHWHORE WORKS IN THE PRESS COMMUNICATIONS DEPARTMENT. She could quite possibly be in charge of vetting any such FOIA release.