nine scabbards. i think it's impossible to be Momo and Hiyori's mom because if memory serves, the last word of their mom is "I don't regret dying" or something like that. means she doesn't want to go in the future anymore because she already find her *life, and that's Oden and their children.
But I think it might be possible...yes I agree that when she was dying,she didn’t plan to go to the future,but on another occasion she clearly knew what would happen in the future,and knew luffy would be some sort of savior,that’s why she send them 20years later...she could’ve any time in the future,right?
So my guess is that she went to the future,maybe even during this exact battle,befor the death of oden....and she knew if they had a chance of winning would be now...but then again she still wanted to die with the love of her life,so she went back....
Sorry for babbling so much and my horrible English (=・ω・=) ⁄(⁄ ⁄·⁄ω⁄·⁄ ⁄)⁄
Can the mysterious person be Momo's mother? And wait, ten people? How many people are in the Red Scabbards again?