My prediction for which character(s) that will die in this arc. My bet is on suneater whom his role in the operation is yet finished if we took the scene where he got swordfish meat from fatgum in consideration. I do agree that killing mirio in this arc to elevate deku's progression would be cop-out but for some reason, i had a bad feeling about overhaul and what he is capable of. I felt that mirio's progression will be developed or  halted depending on the outcome I predicted.