In the game, this sequence was presented as if Malleus' random thought was just coincidentally helpful to Yuu, but in the manga they revised it to Malleus actually helping Yuu without giving him the real answer. I think I prefer the manga interpretation because it's in line with him acting like a king who only gives guidance while letting his subjects grow with their own power.
And also the way he's describing the gargoyles as an allegory to himself... Damn.