User blog comment:B214/Volume 21 info & spoilers/@comment-88.72.252.205-20160130213104/@comment-88.72.252.205-20160130225614

"4. the 666 will be stopped by the Dios Shiva, Azazel, Miguel, and Sirzechs help in the battle, three leaders fight with all its power. We will see or read the true form of Sirzechs, also, because Miguel is the Lord of heaven...(This spoiler is not official)"

I really hope, that this rumor is wrong. It would be just stupid, one volume it awakens, the one afterwards it get's defeated, after all that hype about it's power.