User blog comment:Crimson and Darkness/Volume 25 discussion blog/@comment-179.180.140.193-20180514185630/@comment-179.180.140.193-20180514190739

Look at the arguments of the guy: Sirzechs spoke to Issei who leaves Grayfia with him and the seal can not be broken because azazel has already spoken to beelze q this may affect the future, the tops can not EXISTER for at least 50 years, for this reason azazel has put the seal to 100 ~ 200 years to change the future