User blog comment:Xilinoc/Ch. 552 - The Fundamental Virulence/@comment-5147109-20131008143051

It actually makes perfect sense which explains why Ichigo's could never be stolen, also I don't think that all the training that the captains who had lost their bankai is for nothing, I think they could use the Bankai in conjunction with the new training, for example Hitsugaya, with all the tricks he was able to pull off using his Shikai, now he can apply that same ingenuity to his Bankai and stand toe to toe against 2 SRs.