Technically you can discover against a decoy. But like you said, you can just shoot it. I suppose you just go with whichever has the best bonus. Since they took away a decoy for them, I'm just not on board with it anymore. The starting stats are pretty poor and using an order for just the possibility to get little better seems silly. yeah it's a -9 Reset roll but what if they still get it? It's big bet for little win.