User blog comment:B214/Volume 23 discussion blog/@comment-185.112.105.215-20170422210837/@comment-31137559-20170424135016

Should we say that Rias can't get any stronger since all she has is her Power of Destruction and that's all she has and she can't improve and train? Everyone is constantly training. You don't need a whole bunch of forms to improve like Issei does. By your logic, most of the Sacred Gear possessors shouldn't get any stronger.