User blog comment:Xilinoc/Ch. 659 - There Will Be Frost/@comment-1248963-20160121181832/@comment-1210805-20160122025518

The Bankai Hollowfication was always a temporary thing. Kisuke said so when it was introduced. The Sternritter also stopped stealing them when the Shinigami found a solution, because changing your strategy when your opponent counters it makes sense.