User blog comment:Xilinoc/Ch. 541 - THE BLADE AND ME 2/@comment-7924893-20130612200535/@comment-10630156-20130616082852

I should also point out at some point after fighting Uryu he warned Yamamoto about the Vandenreich (why isn't this on Mayuri's page at the end of the Ryoka invasion plot line something like "Sometime after regaining his form Mayuri warned Yamamoto about the Vandenreich but was ignored by Yamamoto" He states it fairly clearly that it was at this time he warned the old man) Chapter 489 Page 17 I think give or take