Rawwww!!! They did what needed to be done. No loyalists can understand stand. *stares at his claws and checks his ammo load out & says I can't wait to rip any loyalist apart that I see on the battlefield.*
Even the Mechanicus looks down at what the Iron Hands do to themselves, as weird as that sounds it really is true.
They could have told the general why they were in a big hurry... That seemed like that should have been one of the first things to do...
Well, I don't know about you, but if I were creating supah soldjas, I'd replace... pretty much everything except the brain. You want a warrior? Replace everything. Why the Emperor didn't do this in the first place is beyond me...