User blog comment:DBard/Thoughts on True Longinus and God's Dying Will/@comment-1359322-20130725004228

Not sure about everything stated above but the Truth Idea merely chose Issei's "Dream" over Cao Cao's "Ambition". As for Issei becoming a God impossible, God can't have Evil thoughts like Azazel said (that's how Sameal was created), so unless Issei get rids of his perverted thoughts he can't become God.