User blog comment:B214/High School DxD DX.4 discussion/@comment-201.215.165.7-20170630203501/@comment-10330822-20170714052911

He did a quick power-up to DxD against Baraqiel to end the match by destroying the ring, but he fought him primarily in CC. For Dulio, it was mostly in CC too, but he powered-up his arms with DxD in order to strength himself without tiring himself out.

In both cases, he hasn't had a dragged out fight with DxD yet, and I seriously doubt Saji can bring it out of him. More than likely Sona's plan is going to tilt, and Saji can have a shining moment trying to hold out against Issei's power.