It won't work with Silent Kill.When he goes into armour 2 the damage I do is 0 and I have a blockbuster and special move at 15 Lv.Yeaaaah the armor stacking is annoying. You could maybe try to get someone who can remove beneficial buffs of the enemy like Silent Kill Valentine but you might also just flat out need to power up your fighters.
Well,we should also consider newer players where things are damn more annoying
XD