Also, interesting to note, I doubt Erza actually dies regardless because wouldn't Future Lucy have told Jellal about it and had him prevent it? OR.. Jellal said something was different. Didn't Kagura only see Jellal because he was chasing Future Lucy? So maybe in Future Lucy's timeline, Kagura and Erza never fought, and the reason for Erza's (possible) death/defeat was actually because of Lucy's interference.