User blog comment:Stbk22/Possible Power up's/Techniques for then new group DxD/@comment-82.40.154.8-20140104102259/@comment-1359322-20140104113224

He could attain all 4 at the same time too. It's more effective that way.

As to Irina's family Holy Sword, that is just a minor Holy Sword even weaker than the Excalibur fragments, so kinda pointless for her to have it.