User blog comment:B214/Shin DxD 1 discussion/@comment-95.210.189.106-20180815144003/@comment-181.115.108.201-20180815145800

You do realize that Issei and Vali are special cases right? Issei is the only one that can handle the power of infinite because of his body, What Vali got was a blessing that unlocked the dormant potential of his blood and combining it with Albions power with those two things he attained DXD. Saji's has neither of  those things. Befriending Ophis isn't enough otherwise everyone in the Gremory household would by now have a blessing from her.