User blog comment:Xilinoc/Ch. 683 - The Dark Side of Two World Ends/@comment-2211792-20160721122008/@comment-1338810-20160721135527

Bankai are generally the most powerful techniques the Shinigami are capable of, and can prove lethal to even the Wandenreich's strongest fighters. Their Bankai theft strategy is sound; they need to cripple their enemies' best chances at hurting them.