User blog comment:Piyush Banerjee/Shin DxD 2 discussion/@comment-78.48.6.54-20190113221154/@comment-87.4.190.158-20190117221943

No he will never do it. That form was formed by a massive amount power granted by Lilith and Ophis, it wasn't Issei's own power. He will unlock two new form once he unleash the power of the Great Red, that will grant him a new form (without Ophis' power, just Issei's and GR's power within him) and then once he will balance GR power and Ophis' power he will unlock his final form that will combine all his powers.