User blog comment:Dominic1743/“The Heroes' Journey” Discussion/@comment-108.36.76.116-20200124023326/@comment-44905711-20200126115705

There is a module standard by which different types of evidences varying in efficiencies are all judged, for example symptomatic evidence (such as doctors implement). There's also mathematical evidence. So while it's not been directly confirmed to be grace, it's been demonstrated that he possesses silverish blue energy like angels, and to have a power source (15x04). Meaning he has a power source of some kind that is fueled by blue energy.