User blog comment:Xilinoc/Ch. 655 - THE MIRACLE/@comment-1338810-20151211075347

Obviously since Gerard made his monster grow after being "defeated", the way to take him out is a Bankai that summons a giant robot. Duh. :p

And word to the theory that we're going to see more facets to The Miracle over time - because Kubo is still making it up as he goes, doncha know.