User blog comment:Crimson and Darkness/Volume 25 discussion blog/@comment-78.48.214.26-20180524172921/@comment-2607:FB90:3857:7403:0:15:D5F2:3A01-20180525125110

Issei CxC is below Vali's EJOD mainly because his base form is still inferior to Vali's. Issei has yet to awaken GR power. Once he does his base will improve to put him at Vali's level.