@greyhud90
I imagine it's like the difference between AP and HE rounds. It's better for it to detonate inside than outside when dealing with tanky targets. Even that extra few centimeters of penetration for detonation can mean all the difference, because the force of the blast is concentrated inside rather than easily dispersed outside.
This guy minus-state MP perhaps be the requirement for his heavenly attack, i assume. He might juggle between 2 states by switching skill, perhaps, i hope.