User blog comment:Prophet of Sanghelios/Wild and Exciting Speculations!! Part 1!!!/@comment-1752519-20100406123525

well i (aizen) said that he showed it to soul society so probably it was in an event that everyone has to see, wich makes the high rank even more obligated to go, so probably even kenpachi has seen kyoka suigetsu, it has nver been stated otherwise not even by kenpachi or aizen