The only real ways I see them winning is teaming up but that's not going to happen, even with Bellorphon being Anti-Army it's not taking out all of the army made up of low level heroic spirits so not only do they have to fight Iskandar but now he basically has an army of servants that can all fight for him, In the wiki here it says"It's a Powerful Noble Phantasm(Ionioi Hetairori)even Excalibur would not have guaranteed victory agaisnt."
