Now why on Earth would the Sekirei and Ashikabi who escaped would voluntarily come back, on short notice, to fight a combined coalition of presumably the entire world? To save the company that employs a PMC to force them into a deranged death game? To save their fellow Sekirei who tried to kill them and had killed their acquaintances? To help out their few allies who they know are doing very well for themselves? I know the coalition will probably go after them if they do win but man, I can't imagine why they would go back for MBI after risking everything to run away.