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The saint of killers never had that power.
Because he doesn't have it. All his power comes from the guns forged from the angel of deaths sword. Meaning if he didn't have those guns he would simply have normal human accuracy.
This has literally been confirmed from the start of the series. His guns have homing effect.
Hades never forged the armor out of souls, it already existed from the start.
And this power is limited to creating objects/tools/weapons out of souls. The power to create soldiers out of souls is Soul Conversion.