Should everyone have an upper star champion?
As long as they don't have a champion they can not use in the story they can have a hero crystal of a star level above like if you have 4 stars and can't beat act 5 you get a give star and if you can't beat act 5 or 6 they get a 6 star and with the virus I think it might make a distraction and help the scared people have a way to get something off their minds. (P.S.) if your team consists of for 4 stars and one 5 star you get a 5 star since your team is most of 4 stars.