Bills might have to use one of his fingers if flexing doesn't work.
I don't think we know enough about Izuna to determine who would win.
@takashichea: I guess we all make mistakes lol.
@GeneralVan: Azashiro an A class do you remember his feats? True the Soul King is feat less. But do you really think the god of the whole Bleach universe is not going to be way stronger and hax then everybody we have seen so far in Bleach?