User blog comment:Crimson and Darkness/Shin DxD 3 discussion/@comment-36663391-20190823203205/@comment-36663391-20190823210416

Perhaps his link with Issei give him the GR's power and when he feels the dangers he start to growing, I believe that the effect of Ophis's power and Issei's soul and the amrita have change and enhaced their connection... I believe that Indra knowing about Malvezoa  and Ryuteimaru this is the reason for giving the amrita to Issei...